SIG SAUER M400 rifle Owners manual

when it counts™
™
OWNERS MANUAL: HANDLING & SAFETY INSTRUCTIONS
READ THE INSTRUCTIONS AND WARNINGS IN THIS MANUAL CAREFULLY
BEFORE USING THIS FIREARM; DO NOT DISCARD THIS MANUAL.
This instruction manual should always accompany this firearm and be transferred with it upon
ownership, or when the firearm is loaned or presented to another person.
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State-By-State Warnings
Certain states require, by law, that their own specified warning notices, in larger-than-normal type be conspicuously
included by the manufacturer, distributor, or retail dealer with firearms sold in that state. SIG SAUER sells its products
in compliance with applicable laws and regulations. Because our products may be sold in these states, we include the
following:
CALIFORNIA:
WARNING
“Children are attracted to and can operate firearms that
can cause severe injuries or death. Prevent child access
by always keeping guns locked away and unloaded when
not in use. If you keep a loaded firearm where a child
obtains and improperly uses it, you may be fined or sent
to prison.”
ADVERTENCIA
“A los niños atraen las amas de fuego y las pueden hacer
funcionar. Ellos pueden causarse lesions graves y la
muerte. Evite que los niños tengan accesso a las armas de
fuego guardándolas siepre con llave y descargadas cuando
no las esté utilizando. Si usted tiene una arma de fuego
cargada en un lugar en que un niño tiene accesso a ella y
la usa indebidamente, le pueden dar una multa o enviarlo
a la carcel.”
CONNECTICUT:
“UNLAWFUL STORAGE OF A LOADED FIREARM MAY RESULT IN IMPRISONMENT OR FINE.”
FLORIDA:
“IT IS UNLAWFUL, AND PUNISHABLE BY IMPRISONMENT AND FINE, FOR ANY ADULT TO STORE OR LEAVE A FIREARM IN
ANY PLACE WITHIN THE REACH OR EASY ACCESS OF A MINOR UNDER 18 YEARS OF AGE OR TO KNOWINGLY SELL OR
OTHERWISE TRANSFER OWNERSHIP OR POSSESSION OF A FIREARM TO A MINOR OR A PERSON OF UNSOUND MIND.”
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MAINE:
“ENDANGERING THE WELFARE OF A CHILD IS A CRIME. IF YOU LEAVE A FIREARM AND AMMUNITION WITHIN EASY ACCESS
OF A CHILD, YOU MAY BE SUBJECT TO FINE, IMPRISONMENT OR BOTH. KEEP FIREARMS AND AMMUNITION SEPARATE.
KEEP FIREARMS AND AMMUNITION LOCKED UP. USE TRIGGER LOCKS.”
MARYLAND:
“WARNING: Children can operate firearms which may cause death or serious injury. It is a crime to store or leave a loaded
firearm in any location where an individual knew or should have known that an unsupervised minor would gain access to
the firearm. Store your firearm responsibly!”
MASSACHUSETTS:
“WARNING FROM THE MASSACHUSETTS ATTORNEY GENERAL: This handgun is not equipped with a device that fully
blocks use by unauthorized users. More than 200,000 firearms like this one are stolen from their owners every year in
the United States. In addition, there are more than a thousand suicides each year by younger children and teenagers who
get access to firearms. Hundreds more die from accidental discharge. It is likely that many more children sustain serious
wounds, or inflict such wounds accidentally on others. In order to limit the chance of such misuse, it is imperative that
you keep this weapon locked in a secure place and take other steps necessary to limit the possibility of theft or accident.
Failure to take reasonable preventative steps may result in innocent lives being lost, and in some circumstances may
result in your liability for these deaths.”
“IT IS UNLAWFUL TO STORE OR KEEP A FIREARM, RIFLE, SHOTGUN OR MACHINE GUN IN ANY PLACE UNLESS THAT
WEAPON IS EQUIPPED WITH A TAMPER RESISTANT SAFETY DEVICE OR IS STORED OR KEPT IN A SECURELY LOCKED
CONTAINER.”
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NEW JERSEY:
“IT IS A CRIMINAL OFFENSE TO LEAVE A LOADED FIREARM WITHIN EASY ACCESS OF A MINOR.”
NEW YORK CITY, NY:
“THE USE OF A LOCKING DEVICE OR SAFETY LOCK IS ONLY ONE ASPECT OF RESPONSIBLE FIREARMS STORAGE. FOR
INCREASED SAFETY, FIREARMS SHOULD BE STORED UNLOADED AND LOCKED IN A LOCATION THAT IS BOTH SEPARATE
FROM THEIR AMMUNITION AND INACCESSIBLE TO CHILDREN AND OTHER UNAUTHORIZED PERSONS.”
NORTH CAROLINA:
Any person who resides in the same premises as a minor, owns or possesses a firearm, and stores or leaves the firearm
(i) in a condition that the firearm can be discharged and (ii) in a manner that the person knew or should have known that
an unsupervised minor would be able to gain access to the firearm, is guilty of a Class 1 misdemeanor if a minor gains
access to the firearm without the lawful permission of the minor’s parents or a person having charge of the minor and the
minor:
(1)
Possesses it in violation of G.S. 14-269.2(b)
(2)
Exhibits it in a public place in a careless, angry, or threatening manner;
(3)
Causes personal injury or death with it not in self defense; or
(4)
Uses it in the commission of a crime.
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TEXAS:
“IT IS UNLAWFUL TO STORE, TRANSPORT, OR ABANDON AN UNSECURED FIREARM IN A PLACE WHERE CHILDREN ARE
LIKELY TO BE AND CAN OBTAIN ACCESS TO THE FIREARM.”
WISCONSIN:
“IF YOU LEAVE A LOADED FIREARM WITHIN THE REACH OR EASY ACCESS OF A CHILD YOU MAY BE FINED OR IMPRISONED
OR BOTH IF THE CHILD IMPROPERLY DISCHARGES, POSSESSES, OR EXHIBITS THE FIREARM.”
Please check with your licensed retailer, state police, or local police for additional warnings, which may be required by
local law or regulation. Such regulations change constantly, and local authorities are in the best position to advise you on
such legal matters.
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WARNING - LOCKING DEVICES
This firearm was originally sold with a key- operated locking device. While it can help provide secure storage for your
unloaded firearm, any locking device can fail. All guns are designed to fire if they are loaded and the trigger is pulled.
Therefore, never install the locking device inside the trigger guard or in any way that makes it possible to pull the trigger!
Do not leave the keys in the lock.
The ultimate responsibility for secure storage of any firearm must depend upon its owner and his or her individual
circumstances. Firearms should be stored unloaded, in a secure location, separate from their ammunition.
NEVER INSTALL THE LOCKING DEVICE INSIDE THE TRIGGER GUARD
To maximize effectiveness and reduce the chances of malfunction or damage to a firearm, ALWAYS refer to the locking
device’s manufacturer directions for installation and removal of the device.
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FIREARMS SAFETY IS YOUR RESPONSIBILITY
This owner’s manual is designed to assist you in learning how to use and care for your SIG SAUER® pistol properly.
Only when you are certain that you fully understand this manual and can properly carry out its instructions, should you
practice loading and firing your firearm with live ammunition. Having a gun in your possession is a full-time job; you
cannot guess and you cannot forget. You must know how to use your firearm safely.
If you have any doubts about your ability to handle or use this firearm safely, you should seek supervised instruction.
The Sig Sauer Academy™ provides all levels of firearms safety and skill training, from beginner to expert.
For more information contact:
www.sigsaueracademy.com • (603) 679-2003
Main campus: Satellite Facilities: Epping, New Hampshire
Range 82, Midland, VA
NRA Whittington Center, Raton, NM
SAFETY MUST BE THE FIRST AND CONSTANT CONSIDERATION OF
EVERY PERSON WHO HANDLES FIREARMS AND AMMUNITION.
For more information about safety, responsible firearms ownership, and shooting sports, contact:
National Rifle Association (NRA) of America, 11250 Waples Mill Road, Fairfax, VA 22030-7400
1-800-672-3888 • www.nra.com
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TABLE OF CONTENTS
Topic
Page
State by State Warnings2-5
Locking Device6
General Safety Information and Mechanical Characteristics
14
Basic Rules of Safe Firearms Handling
15
1.0 Safety Information14
1.1 Protect your Eyes and Ears
16
1.2 Ammunition16
2.0 Mechanical Characteristics and Rifle Theory
21
2.1 Rifle Description21
2.1.1 General21
2.1.2 Barrel with Receiver and Gas System
21
2.1.3 Bolt and Bolt Carrier Assembly
22
2.1.4 Hand Guard23
2.1.5 Lower Receiver and Buttstock Assembly
24
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Topic
Page
2.1.7 Buttstock Operation26
2.1.8 Trigger Guard Operation30
2.1.9 Sights32
2.1.10 Magazine39
2.2 Technical Specification40
2.2.1 Operation of Fire Control Selector /Safety
41
3.0. Handling43
3.1 Important Instructions43
3.2 Loading the Magazine44
3.3 Loading the Rifle45
3.4 Reloading the Rifle (partially loaded magazine in rifle)
46
3.5 Reloading the Rifle (empty magazine in rifle)
47
4.0 Cycle of Operation48
4.1 Firing49
4.1.1 Unlocking of the Bolt, Extraction, and Ejection
49
4.1.2 Cocking of the Hammer50
4.1.3 Chambering and Locking50
5.0 Unloading51
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Topic
6.0 Procedures in case of a Stoppage
6.1 Failure to Fire (Cold Rifle)
6.2 Failure to Fire (Hot Rifle)
Page
52
52
53
7.0 Field Strip Disassembly55
7.1 Detailed Disassembly of the Bolt Carrier and Bolt
56
7.2 Extractor Removal57
7.3 Hand Guard Removal58
7.4 Removal of Recoil Buffer and Action Spring
59
8.0. Cleaning60
8.1 Bore61
8.2 Chamber61
8.3 Bolt62
8.4 Bolt Carrier62
8.5 Action Spring and Receiver Extension
62
8.6 Magazine63
9.0. Reassembly64
9.1. Recoil Buffer and Action Spring
64
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Topic
Page
9.2 Extractor66
9.3 Bolt to Bolt Carrier67
9.4 Bolt Carrier to Upper Receiver
70
9.5 Rejoining Upper and lower Receivers
71
10.0 Perform a Function Check72
11.0 Lubrication73
12.0 Transportation and Storage75
13.0 Service and Replacement Parts Policy
76
14.0 Shipping Firearms for Repair78
15.0 Parts Diagram80
16.0 Parts List81
SIG SAUER Limited Lifetime Firearms Warranty
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WARNINGS OF GREAT IMPORTANCE
ARE FOUND WITHIN THIS MANUAL
Locking Devices
6
Alterations13
Manual Safety
25
Ammunition
17, 20
Lead Exposure
20
Handling43
Loading45
Firing48
Storage75
Parts Purchasers
77
Shipping79
OTHER CAUTIONS AND WARNINGS APPEAR THROUGHOUT THE MANUAL
FIREARMS ARE DANGEROUS WEAPONS
READ THE INSTRUCTIONS AND WARNINGS IN THIS MANUAL
THOROUGHLY AND CAREFULLY BEFORE USING.
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WARNING - ALTERATIONS
This product was designed to function properly in its original condition.
Alterations can make it unsafe. Do not alter any part or add or substitute any
parts or accessories not manufactured by SIG SAUER Inc.
DO NOT ALTER ANY GUN
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GENERAL SAFETY INFORMATION AND MECHANICAL CHARACTERISTICS
1.0 Safety Information
The safety warnings in this manual are important. By understanding the dangers inherent in the use of any firearm, and
by taking the precautions described herein, you can enjoy complete safety in the use of your rifle. Failure to heed any of
these warnings may result in serious injury to you or others, as well as severe damage to the firearm or other property.
SIG SAUER Inc. shall not be responsible in any manner whatsoever for malfunctioning of the firearm, physical injury or
property damage resulting in
whole or in part from:
1) criminal or negligent discharge;
2) improper or careless handling;
3) unauthorized modifications;
4) defective, improper, hand-loaded, or reloaded ammunition;
5) corrosion;
6) neglect; or
7) other influences beyond our direct and immediate control.
This limitation applies regardless of whether liability is asserted on the basis of contract, negligence, or strict liability
(including any failure to warn). Under no circumstance shall SIG SAUER Inc. be liable for incidental or consequential
damages, such as loss of use of property, commercial loss, and loss of earnings or profits.
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THE BASIC RULES OF SAFE FIREARMS HANDLING
1. ALWAYS treat every gun as if it were loaded.
2. ALWAYS be sure the barrel is clear of any obstruction.
3. ALWAYS be sure of your backstop, what lies beyond, and the safety of bystanders before you shoot.
4. ALWAYS use clean, dry, original factory-made ammunition of the proper type and caliber for your gun.
5. ALWAYS wear ear protection and safety glasses when shooting.
6. ALWAYS carry your gun so that you can control the direction of the muzzle if you fall or stumble.
7. NEVER shoot at a flat surface or water.
8. DO NOT leave an unattended gun loaded. Guns and ammunition should be stored separately, locked if possible, beyond
the reach of children, careless adults, and unauthorized users.
9. NEVER allow your firearm to be used by anyone who has not read and understood this operator’s manual.
10. DO NOT point any gun, loaded or unloaded, at any undesired target.
11. NEVER fire your rifle near an animal unless it is trained to accept the noise: an animal’s startled reaction could injure it
or cause an accident.
12. NEVER drink alcoholic beverages or take drugs before or during shooting, as your vision and judgment could be
seriously impaired, making your gun handling unsafe.
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1.1 Protect Your Eyes And Ears
Always wear safety glasses and ear plugs or “earmuff” type protectors whenever you are shooting. Always make certain
that persons close to you are similarly protected. Unprotected eyes may be injured by powder, gas, carbon residue,
lubricant, metallic particles, or similar debris which may emanate occasionally from any firearm in normal use. Without
ear protection, repeated exposure to shooting
noise may lead to cumulative, permanent hearing loss.
1.2. Ammunition
1. Use only high quality, original, factory-manufactured ammunition. Do not use cartridges that are dirty, wet, corroded,
bent, or damaged. Do not oil cartridges. Do not spray aerosol-type lubricants, preservative, or cleaners directly onto
cartridges or where excess spray may flow into contact with cartridges. Lubricant or other foreign matter on cartridges
can cause potentially dangerous ammunition malfunctions. Use only ammunition of the caliber for which your firearm is
chambered. The proper caliber is permanently engraved on your firearm; never attempt to use ammunition of any other
caliber.
2. The use of reloaded, “remanufactured” hand-loaded, or other non-standard ammunition voids all warranties. Reloading
is a science and improperly loaded ammunition can be extremely dangerous. Severe damage to the firearm and serious
injury to the shooter or to others may result. Always use ammunition that complies with the industry performance
standards established by the Sporting Arms and Ammunition Manufacturers’ Institute, Inc. of the United States (SAAMI) or
ammunition manufactured to military specifications.
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WARNING – AMMUNITION (CARTRIDGE) NOTICE
SIG SAUER Inc. SPECIFICALLY DISCLAIMS RESPONSIBILITY FOR ANY DAMAGE OR
INJURY WHATSOEVER OCCURRING IN CONNECTION WITH, OR AS A RESULT OF, THE USE IN ANY SIG SAUER FIREARM OF
FAULTY, NON-STANDARD, “REMANUFACTURED” HAND LOADED (RELOADED) AMMUNITION, OR CARTRIDGES OTHER THAN
THOSE FOR WHICH THE FIREARM WAS ORIGINALLY CHAMBERED.
3. Firearms may be severely damaged and serious injury to the shooter or to others may result from any condition
causing excessive pressure inside the chamber or barrel during firing. Excessive pressure can be caused by obstructions
in the barrel, propellant powder overloads, the use of incorrect cartridges or defectively assembled cartridges. In addition,
the use of a dirty, corroded, or damaged cartridge can lead to a burst cartridge case and consequent damage to the
firearm and personal injury from the sudden escape of high-pressure propellant gas within the firearm’s mechanism.
4. Immediately stop shooting and check the barrel for a possible obstruction whenever:
• You have difficulty in, or feel unusual resistance in, chambering a cartridge;
• A cartridge misfires (does not go off);
• The mechanism fails to extract a fired cartridge case;
• Unburned grains of propellant powder are discovered spilled in the mechanism;
• A shot sounds weak or abnormal. In such cases it is possible that a bullet is lodged part way down the barrel.
• Firing a subsequent bullet into the obstructed barrel can wreck the firearm and cause serious injury to the shooter
or to bystanders.
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5. Bullets can become lodged in the barrel:
• If the cartridge has been improperly loaded without propellant powder, or if the powder fails to ignite (ignition of
the cartridge primer alone will push the bullet out of the cartridge case, but usually does not generate sufficient
energy to expel the bullet completely from the barrel);
• If the bullet is not properly seated in the cartridge case. When such a cartridge is extracted from the chamber
without being fired, the bullet may be left behind in the bore at the point where the rifling begins. Subsequent
chambering of another cartridge may push the first bullet further into the bore.
6. If there is any reason to suspect that a bullet is obstructing the barrel, immediately unload the firearm and look through
the bore. It is not sufficient to merely look in the chamber. A bullet may be lodged some distance down the barrel where
it cannot easily be seen.
IF A BULLET IS IN THE BORE, DO NOT ATTEMPT TO SHOOT IT OUT BY USING ANOTHER CARTRIDGE OR BY
BLOWING IT OUT WITH A BLANK OR ONE FROM WHICH THE BULLET HAS BEEN REMOVED. SUCH TECHNIQUES CAN
GENERATE EXCESSIVE PRESSURE, WRECK THE FIREARM, AND CAUSE SERIOUS PERSONAL INJURY.
If the bullet can be removed with a cleaning rod, clean any unburned powder grains from the bore, chamber, and
mechanism before resuming shooting. If the bullet cannot be dislodged by tapping it with a cleaning rod, take the firearm
to a gunsmith.
7. Dirt, corrosion, or other foreign matter on a cartridge can impede complete chambering and may cause the cartridge
case to burst upon firing. The same is true of cartridges which are damaged or deformed.
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8. Do not oil cartridges, and be sure to wipe the chamber clean of any oil or preservative before commencing to shoot. Oil
interferes with the friction between cartridge case and chamber wall that is necessary for safe functioning, and subjects
the firearm to stress similar to that imposed by excessive pressure.
9. Use lubricants sparingly on the moving parts of your firearm. Avoid excessive spraying of any aerosol gun care product,
especially where it may get on ammunition. All lubricants and aerosol spray lubricants in particular can penetrate
cartridge primers and cause misfires. Some highly penetrative lubricants can also migrate inside cartridge cases and
cause deterioration of the propellant powder; on firing, the powder may not ignite. If only the primer ignites, there is
danger that the bullet may become lodged in the barrel.
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WARNING - AMMUNITION
Death, serious injury, and damage can result from the use of wrong ammunition, bore
obstructions, powder overloads, or incorrect cartridge components. Always wear shooting
glasses and hearing protectors.
IMPROPER AMMUNITION DESTROYS GUNS
WARNING - LEAD EXPOSURE
Discharging firearms in poorly ventilated areas, cleaning firearms, or handling ammunition may
result in exposure to lead and other substances known to the state of California to cause birth
defects, reproductive harm, and other serious physical injury. Maintain adequate ventilation at
all times. Wash hands thoroughly after exposure.
SHOOTING OR CLEANING GUNS MAY EXPOSE YOU TO LEAD
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2.0. Mechanical Characteristics and Rifle Theory
2.1 Rifle Description
2.1.1 General
The SIG M400 rifle is a direct impingment rifle with a rotary bolt mechanism capable of semi-automatic or full automatic
fire operation. Semi-Automatic is defined as one round being fired each time the trigger is pressed to the rear until the
magazine is depleted of ammunition. The rifle is chambered in 5.56x45mm NATO and is compatible with .223 Remington
ammunition.
2.1.2 Barrel, Receiver and Gas System
The barrel is mechanically mated to the receiver by means of a barrel nut, and the barrel extension. The flash suppressor
if applicable is screwed onto the muzzle end of the barrel via ½ x 28 TPI thread pattern. The front sight housing, which is
fitted to the barrel, contains the gas port and the front sight. The upper receiver has an integral M1913 accessory rail for
attachment of sights or optics.
FIG 1 BARREL WITH RECEIVER AND GAS SYSTEM
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2.1.3. Bolt/Bolt Carrier Assembly
The bolt carrier guides the bolt and controls locking and unlocking by means of the cam pin. The bolt carrier incorporates
a carrier key that transfers gas from the gas tube to the belt carrier assembly. The bolt carrier is responsible for cocking
the hammer.
Cam Pin
Bolt Carrier
Bolt
FIG 2 BOLT CARRIER
The bolt houses the firing pin, the extractor and the ejector. It incorporates locking lugs that lock the bolt into the barrel
extension. The cam pin passes into the bolt which allows for locking and unlocking and is retained in the bolt by the firing pin.
Bolt Rings
Ejector
FIG 3 BOLT ASSEMBLY
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Extractor
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2.1.4. Hand Guard
The hand guard protects the barrel and the gas system from damage and provides protection from barrel heat. The
FIG 4 HAND GUARD ASSEMBLY ON RIFLE
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2.1.5. Lower Receiver Assembly and Butt stock
The lower receiver assembly contains the fire control mechanism, bolt catch, magazine well, magazine release, pistol
grip, sling attachment points, and butt stock assembly. The fire control selector is ambidextrous along with the magazine
catch. The fire control selector has two positions, SAFE-SEMI.
SAFE - Trigger is locked and rifle cannot be fired.
SEMI - The rifle will fire one shot with each press of the trigger.
Bolt Catch Lever
Sling attachment point
Magazine release
Fire control selector
FIG 5 LOWER RECEIVER ASSEMBLY
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MANUAL SAFETY “ON”
MANUAL SAFETY “OFF”
FIG 6 FIRE CONTROL SELECTOR POSITION SAFE-SEMI
WARNING - MANUAL SAFETY:
Keep the safety “ON” unless actually firing. Always move the safety to its intended position and check it. The safety is
not “ON” unless it is completely “ON.” Never depend on a safety mechanism or any other mechanical device to justify
careless handling or permitting the rifle to point in an unsafe direction. The only “safe” rifle is one in which the bolt is
open, the chamber is empty, and there is no magazine in the gun.
KNOW HOW TO USE THE SAFETY
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2.1.7. Butt Stock Operation
The SIG M400 is equipped with a telescoping butt stock. The butt stock may vary depending on the model. The butt stock
on the SIG M400 may vary depending on the specific model you have. The butt stock provides for easy adjustment of
the length to accommodate the individual shooter or for storage. To adjust the length of the butt stock, fully depress the
release latch and pull the stock rearward to extend or push the stock forward to collapse.
Intermediate positions may be selected by partially depressing the release latch and moving the stock to the desired
position.
Release Latch
FIG 7 BUTT STOCK
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Release Latch
FIG 13 BUTT STOCK COLLAPSED AND FULLY EXTENDED
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To remove the butt stock:
Depress the adjustment lever to disengage the release latch and slide the stock to full extension.
Grasp the release latch and pull down as you slide the stock from the receiver extension.
FIG 14 BUTT STOCK REMOVAL
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To re-install the butt stock:
DO NOT FORCE THE PARTS TOGETHER! Align the stock body with the receiver extension and Gently slide the butt stock
onto the receiver extension until it stops (About 2 1/8”) Grasp the release latch and pull down as you slide the stock the
rest of the way on to the receiver extension.
Check to see that the stock moves to all positions locks into place.
FIG 15 INSERT VIEW OF BUTT STOCK INSTALLATION
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2.1.8. Trigger Guard Operation
The trigger guard may be released from its normal position to make the trigger accessible for shooting with gloves. For
safety reasons the trigger guard must not be released until just before firing the weapon. It should be returned to its
normal position immediately.
CAUTION: BE CAREFUL WHEN INSERTING GLOVED FINGERS INTO THE TRIGGER GUARD AS ACCIDENTAL DISCHARGES MAY
OCCUR!
To release the trigger guard, depress the spring loaded detent on the front right side and rotate the guard downward.
FIG 16 TRIGGER AND GUARD RELEASE
To close the guard rotate the trigger guard back into place, depress the spring loaded detent and ensure the guard locks
into place.
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WARNING:
DO NOT MANIPULATE THE TRIGGER GUARD UNLESS THE FIRE CONTROL SELECTOR
IS ON “SAFE” AND THE RIFLE IS UNLOADED.
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2.1.9. Sights
The SIG M400 rifle features integrated Mil-Std M1913 rails on the upper receiver. These rails may be used for attaching a
variety of sighting systems, both optical and fixed. These sights are designed to provide a simple, durable sighting solution
should you decide not to use an optical device.
FIG 17 SIG M400 SIGHT ASSEMBLY
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Adjustable Rear Sight
SHORT RANGE - This “larger aperture is used for 0-200 meters range. As
shown, the sight is set for 0-200 meters. This larger aperture is only used
when the rear sights all the way down. In other words, the 300-meter
mark is aligned with the mark on the left side of the receiver.
FIG 18 SIGHT ADJUSTMENT FOR 0-200 METERS
NORMAL RANGE -The aperture is unmarked and used for most firing
situations. It is used in conjunction with the elevation knob for 300, 400,
500, 600-meter targets.
FIG 19 SIGHT ADJUSTMENT FOR 300-600 METERS
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Zeroing your SIG M400
a The front sight post and rear sight windage knob are adjusted so you can hit your point of aim at 300 meters.
b The unmarked aperture must be in the up position.
c. The 300-meter mark is aligned with the mark on the left side of the receiver. This will read 6/3 for the M400.
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Zeroing Adjustments
1. During zeroing procedures, only the front sight post and windage knob are adjusted to move the strike of the bullet on
the target.
2. If you are zeroing on a 25-meter range, the rear sight elevation knob is adjusted in accordance to whichever weapon
you are using.
3. Detailed zeroing procedures are on the target and the following pages.
FRONT SIGHT - The front sight post is moved up or down when zeroing the weapon. Once the weapon is zeroed, the
front sight post should not be moved.
To adjust elevation, depress detent and rotate post. To raise strike of bullet, rotate post in the direction of arrow marked
UP. Reverse the direction of rotation to lower strike of bullet. Each graduation (notch) moves the point of impact of bullet
as indicated.
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Changes in point of impact
FOR ELEVATION (per click)
FOR ELEVATION (per click)
CLICKS
IMPACT
DISTANCE
CLICKS
IMPACT
DISTANCE
1
0.9 cm (3/8 in.)
25 meters
1
1.2 cm (1/2 in.)
25 meters
2
3.5 cm (1 3/8 in.)
100 meters
2
4.8 cm (1 7/8 in.)
100 meters
3
7.0 cm (2 ¾ in.)
200 meters
3
9.6 cm (3 ¾ in.)
200 meters
FOR WlNDAGE KNOB (per click)
FOR WlNDAGE KNOB (per click)
CLICKS
CLICKS
IMPACT
DISTANCE
IMPACT
DISTANCE
1
0.3 cm (1/8 in.)
25 meters
1
0.5 cm (3/16 in.)
25 meters
2
1.25 cm (1/2 in.)
100 meters
2
1.9 cm (3/4 in.)
100 meters
3
2.60 cm (1 in.)
200 meters
3
4.8 cm (1 ½ in.)
200 meters
4
3.8 cm (1 ½ in.)
300 meters
4
5.7 cm (2 1/4 in.)
300 meters
5
5.0 cm (2 in.)
400 meters
5
7.6 cm (3 in.)
400 meters
6
6.3 cm (2 Min.)
500 meters
6
9.5 cm (3 3/4 in.)
500 meters
7
7.8 cm (3 in.)
600 meters
7
11.4 cm (4 1/2 in.)
600 meters
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Zeroing Adjustments (Cont)
To remember your correct zero windage, note location of windage scale and windage knob pointer (heavy mark on
outside of knob).
Do not center rear sight aperture for inspections. Keep your correct bat&sight zero windage on your weapon at all times.
By following the steps below and establishing a zero at 25 meters, your sights will be set with a 300-meter battlesight.
NOTE: Do not move front sight post at this time. lt was set at the factory or by a previous shooter and should be very
close to your zero.
Center the rear sight aperture by turning the windage knob left or right. (This is called mechanical zero windage.)
1. Position a 25 Meter Zero Target; 25 meters from the firing line.
2. The unmarked long range aperture should be up.
3. Rotate elevation knob in the down direction (counter-clockwise). The elevation knob should stop on the 300-meter
mark (6/3). The rear sight should be all the way down on the last whole “click” before it bottoms out. This is called
mechanical zero elevation for the rear sight If your range scale will not line up in the above manner, an armor will be
required to adjust the range scale for you.
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4. Now rotate the elevation knob clockwise (up) two clicks for the SIG M400 rifle. The elevation knob should remain
aligned on the 300 meter setting for the SIG M400 carbine. Any further corrections required in elevation are made
to the front sight post only.
5. Aim at target center. Adjust front sight and rear windage to move shot group center as close as possible to the while
dot in the center of target.
6. If your shot group is not in the center of the bull’s eye, use the squares on the target sheet to calculate the required
“clicks” necessary to move your next shot group into the bull’s-eye. (Remember that any changes in elevation are made
by moving the front sight post.) The squares are numbered around the edges of the target to equal the number of clicks
required to move the shot group to the bull’s eye.
7. In order to raise your next shot group, rotate the front sight post clockwise. (One click will move the strike of the
bullet one vertical square on the target sheet) In order to lower your next shot group, rotate the front sight post
counterclockwise (one click, as above, equals one square). Changes in windage are made with the windage knob. (Three
clicks will move the strike of the bullet one horizontal square on the target sheet). In order to move the shot group to
the left, turn the windage knob counterclockwise. In order to move the shot group to the right, turn the windage knob
clockwise.
8. Carefully aim and fire another group at the center of the target bull’s eye.
9. Repeat Steps 6 through 8, if required.
10. If your group is centered, your weapon is now zeroed.
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2.1.10. Magazine
The SIG M400 rifle ships with (1) one thirty (30) round aluminum magazine. The SIG M400 is compatible with most M16/
AR15 type magazines.
Aftermarket magazines should always be checked for proper fit and function prior to using them with the SIG M400 rifle.
FIG 20, 20 AND 30 RD MAGAZINE
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2.2. Technical Specifications
CALIBER
5.56 x 45mm NATO
OVERALL LENGTH
39.5”
LENGTH WITH STOCK COLLAPSED
36.0”
OVERALL HEIGHT
7.31”
BARREL LENGTH WITH FLASH SUPPRESSOR
16”
BARREL CONTOUR
Mil-Spec M4 Profile
RIFLING LEAD
1 in 7”
NUMBER OF GROOVES
6
MUZZLE BRAKE
Mil-Spec
SIGHT RADIUS
14.2”
WEIGHT WITHOUT MAGAZINE
6.5 lbs
MAGAZINE TYPE
AR-15 Type Aluminum
MAGAZINE CAPACITY
30
TRIGGER
Mil-STD
TRIGGER PULL
7.6 lbs
Specifications are approximate and subject to change.
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2.2.1 Operation of Fire Control/Safety
Four basic fundamentals of safe firearm handling should be applied during any and all activities described in this manual.
Treat every firearm as if it were loaded.
Always keep the muzzle pointed in a safe direction until ready to shoot.
Keep your finger off of the trigger and out of the trigger guard until ready to fire.
Be aware of your target and what is beyond it.
The SIG M400 is equipped with an ambidextrous fire control selector lever commonly referred to as a “safety lever” which
can be manipulated from either the left or right side of the lower receiver. The selector has two (2) positions, SAFE and SEMI.
SAFE - Trigger is locked and rifle CANNOT be fired with a normal press of the trigger.
MANUAL SAFETY “ON”
FIG 21 FIRE CONTROL SELECTOR ON SAFE
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SEMI – The trigger is no longer locked and the rifle WILL FIRE one shot with each press of the trigger until either the
operator stops firing or the ammunition is expended from the magazine.
MANUAL SAFETY “OFF”
FIG 22 FIRE CONTROL SELECTOR ON SEMI
The fire control selector should always be in the SAFE position except when the operator is actually going to fire the rifle,
and upon completion of firing.
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3.0 Handling
3.1 Important Instructions
•
•
•
•
•
•
•
Before manipulating the weapon, ensure the fire control lever is in the “S” (SAFE) position and the trigger guard is in
the closed position.
Use only factory-new ammunition which corresponds to the caliber of the weapon.
During all manipulations of the rifle, point the weapon in a safe direction.
Do not place your finger on the trigger until the target has been verified and you intend to shoot.
Do not load the weapon until immediately before use.
Unload weapon immediately after shooting is finished.
Remove the bolt carrier assembly and magazine from the weapon prior to transportation.
WARNING - HANDLING:
Never carry the rifle loaded with the safety lever in the “F” (FIRE) position. If dropped or struck with the safety off (“F”),
the rifle may fire. Such a discharge can occur with or without the trigger being directly struck or touched. Never rest a
loaded rifle against any object (wall, tree, fence, vehicle, etc.) because there is always the possibility that the rifle will
be jarred or slide from its position and fall with sufficient force to discharge. Keep the safety lever on “S” (SAFE) unless
actually firing.
ANY GUN MAY FIRE IF DROPPED
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3.2 Loading the Magazine
FIG 23 516 MAGAZINE BEING LOADED
1. Ensure the magazine is the proper type and caliber for the rifle;
2. Place a round between the feed lips and press down- ensure the bullet is facing the front of the magazine;
3. Ensure the cartridges are fully seated to the rear of the magazine by tapping the back of the magazine in the palm of
the hand.
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3.3 Loading the Rifle
1. Ensure the safety lever is in the “S” (SAFE) position;
2. Insert the magazine and check that it is properly seated;
3. Bolt forward: Pull the charging handle back fully and release; or
4. Bolt locked open: Depress bolt catch fully to release bolt.
WARNING:
DO NOT LOAD A RIFLE WITH A HOT CHAMBER BECAUSE A ROUND
MAY “COOK” OFF (i.e., a round may detonate (fire) unexpectedly
just because it is exposed to the heat of the rifle’s chamber).
FIG 24 MAGAZINE BEING INSERTED
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3.4 Reloading the Rifle after firing has commenced (partially loaded
magazine still in rifle).
1. Place fire control selector on SAFE.
2. Keep muzzle pointed in a safe direction and finger out of the trigger guard!
3. Depress magazine catch and remove magazine.
FIG 25 MAG CATCH BEING DEPRESSED LEFT AND RIGHT SIDE
4. Insert loaded magazine and ensure it is seated properly.
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3.5 Reloading the Rifle after firing has commenced (bolt locked open, empty
magazine still in rifle).
1. Place fire control selector on SAFE.
2. Keep muzzle pointed in a safe direction and finger out of the trigger guard!
3. Depress magazine catch and remove magazine.
4. Insert loaded magazine and ensure it is seated properly.
5. Release the bolt by either:
a. Depressing bolt catch fully releasing the bolt;
b. Grasping the charging handle, retracting it slightly and releasing it.
WHEN COMPLETING STEP 5.B ABOVE, RELEASE THE CHARGING HANDLE AND LET IT GO FORWARD UNDER FULL SPRING
POWER. DO NOT RIDE THE CHARGING HANDLE FORWARD AS THIS MIGHT CAUSE A FAILURE OF THE CARTRIDGE TO FULLY
SEAT INTO BATTERY.
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4.0 Cycle of Operation
Ready to Fire Condition
The SIG M400 “Ready to Fire” condition is described as a loaded magazine properly seated into the magazine well, a live
cartridge loaded into the chamber, the fire control selector place on “SAFE”.
WARNING - FIRING
The bolt automatically opens and shuts quickly while firing. Keep face and
hands away from it. Hot brass and powder gas is ejected quickly and can
burn you. The rifle should be fired from the right shoulder. Always wear
shooting glasses and hearing protectors.
BOLT OPENS FAST – HOT BRASS EJECTED
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4.1. Firing
Rotate the fire control selector from the “SAFE” position to the “SEMI” position.
Pressing the trigger rearward releases the hammer causing it to strike the firing pin, impacting the cartridge primer.
CAUTION: THE SIG M400 IS A SEMI-AUTOMATIC RIFLE AND WILL AUTOMATICALLY RELOAD THE NEXT CARTRIDGE IN THE
MAGAZINE AFTER THE CHAMBERED CARTRIDGE IS FIRED FOLLOWING ONE PRESS OF THE TRIGGER. THE RIFLE WILL NOW
BE READY TO FIRE AGAIN ONCE THE TRIGGER IS RELEASED.
4.1.1. Unlocking of Bolt; Extraction & Ejection
1. The gas pressure generated by the burning powder in the cartridge, propels the bullet through the bore of the barrel.
2. When the bullet passes the gas port in the barrel a portion of the gas flows up into the gas block and into the gas tube.
3. The gas travels through the gas tube and drives the bolt carrier rearward.
4. As the bolt carrier moves rearward the cam pin allows the bolt to rotate to the right and unlock from the barrel
extension.
5. As the bolt carrier continues rearward movement the extractor, gripping the right side of the expended cartridge case
pulls the case from the chamber.
6. Once the expended case clears the chamber, the ejector located on the left side of the bolt face pushes the case out
the ejection port located on the right side of the upper receiver.
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4.1.2. Cocking of the Hammer
1. As the bolt carrier assembly continues rearward the bottom surface of the bolt carrier cocks the hammer rearward.
2. The hammer is then captured by the disconnect and held in place.
4.1.3 Chambering and Locking
1. Once the bolt carrier reaches its full rearward travel the buffer and recoil spring force the bolt carrier assembly forward.
2. As the bolt carrier assembly moves forward the next cartridge is stripped from the magazine and loaded into the chamber.
3. The bolt continues forward, rotates to the left, and locks into place.
4. The trigger is released and the hammer moves to its location of engagement with the trigger.
5. The rifle is now ready to be fired again.
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5.0. Unloading
ALWAYS MAKE SURE THE MUZZLE IS POINTED IN A SAFE DIRECTION!
1. Ensure the fire control selector is rotated to the “SAFE” position.
2. Remove the magazine by depressing the magazine catch; and
3. Retract the charging handle locking the bolt carrier assembly to the rear; and
4. Visually and physically inspect the chamber to verify it is empty.
Remember to clear the chamber after the magazine is removed.
Never assume that any firearm is unloaded until you have personally checked it, visually and physically.
After every range session make sure the firearm is unloaded before you leave the range.
WARNING:
Removing cartridges from the magazine does not prevent the rifle from being fired! When there is a cartridge in the
chamber and the safety lever is in the “F” (FIRE) position, the cartridge will discharge if the trigger is pulled. It is absolutely
essential for the user to know how to completely unload the rifle.
“Completely” means emptying the magazine and removing a chambered cartridge. The safety lever should always be in
the “S” (SAFE) position when the rifle is being unloaded.
THE RIFLE WILL FIRE EVEN IF THE MAGAZINE IS EMPTY OR REMOVED
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TO CLEAR A STOPPAGE (JAM)
6.0. Procedures In Case of a Stoppage
A “Stoppage” is an interruption in the cycle of operation as depicted in Section 4.0. A stoppage can normally be repaired
by the operator by performing one of the following immediate actions described.
6.1. Failure to Fire (Cold Rifle) Trigger is pressed, hammer falls, rifle does not fire.
1. Ensure the magazine is properly seated in the magazine well by applying upward pressure and then pulling down on
the magazine.
2. Retract the charging handle all the way back and observe the ejection of the expended case or a live cartridge; and
3. Visually inspect the chamber for any obstructions, if the chamber shows to be clear, release the charging handle to
feed a new cartridge. Do NOT ride the charging handle forward.
4. Attempt to fire the rifle again.
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6.2. Failure to Fire (Hot Rifle) Trigger is pressed, hammer falls, the rifle does
not fire.
1. Keep the muzzle pointed down range, place the rifle on SAFE, remove the magazine, if you cannot extract the loaded
cartridge within ten (10) seconds you must wait a minimum of 15 minutes before handling the rifle.
2. Upon completion of the 15 minutes, retract the charging handle all the way back and observe the ejection of the
cartridge; and
3. Visually inspect the chamber for any obstructions, if the chamber shows to be clear, release the charging handle to
feed a new cartridge. DO NOT ride the charging handle forward.
4. Attempt to fire the rifle again.
If the rifle does not fire after completing 6.1 or 6.2:
1. Unload, and clear the rifle.
3. Cycle the bolt assembly chambering a round; and
2. Insert a fresh magazine;
4. Attempt to fire the rifle.
If the rifle fails to fire after attempting all of the above, the rifle should be returned to SIG SAUER, Inc. for evaluation by a
factory trained technician.
WARNING:
EXCESSIVE HEAT BUILD UP IN THE CHAMBER CAN CAUSE WHAT IS REFERRED TO AS A “COOK OFF”. THIS MEANS THE
HEAT IN THE CHAMBER CAUSES THE POWDER TO IGNITE IN THE CHAMBERED CARTRIDGE. THE ROUND THEN DETONATES
JUST AS IF IT WERE FIRED. IF THE RIFLE HAS BEEN FIRED FOR AN EXTENDED PERIOD OF TIME FOLLOW THE STEPS IN 6.2.
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6.4. Feedway Stoppage (Jam)
A feedway stoppage occurs when one or more rounds are trapped in the upper receiver and stop the cycle of operation.
To clear this problem:
1. Place the rifle on SAFE.
2. Remove the magazine (You might have to pull downward with some force to remove the magazine from the magazine
well due to the jammed cartridges).
3. Cycle the bolt carrier assembly several times to clear any rounds from the receiver; and
4. Lock the bolt carrier to the rear, conduct a visual and physical inspection of the chamber to make sure the chamber
has no obstructions; and
5. Insert a fresh magazine and continue to fire the rifle.
CAUTION: Always remove the source of ammunition (magazine) prior to attempting to clear a stoppage that requires
retracting the charging handle/bolt carrier assembly as unintentional release of the spring loaded bolt carrier assembly
could detonate live cartridges lodged in the upper receiver.
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7.0. Field Strip Disassembly
1. Unload and clear the rifle per section 5.0.
2. Ensure the bolt carrier assembly is forward and the fire control selector is placed on SAFE.
3. Press the takedown pin from left to right until it stops (It is held into the lower receiver by a detent and will not pull free
from the receiver).
Takedown Pin
Pivot Pin
FIG 27 THE TAKEDOWN PIN AND PIVOT PIN
4. Press the Pivot Pin (front pin) from left to right until it stops at the detent.
5. Separate the upper receiver from the lower receiver.
6. Grasp the charging handle and pull it rearward until it stops.
7. Remove the bolt carrier assembly from the rear opening of the upper receiver.
8. Align the tabs of the charging handle and lift it from the receiver.
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7.1. Detailed Disassembly of the Bolt Carrier and Bolt.
1. Remove the firing pin retaining pin from the left side of the bolt carrier. A small punch might be needed for this
procedure.
2. Tilt the bolt carrier upward and catch the firing pin as it slides out of the rear of the bolt.
3. Rotate the bolt cam pin ¼ turn and lift it straight up out of the bolt carrier.
4. Pull the bolt out from the front of the bolt carrier.
FIG 28 INSERT DETAILED DIAGRAM OF BOLT AND BOLT CARRIER
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7.2. Extractor Removal
1. Apply slight pressure to the rear of the extractor with the thumb.
2. Using a punch, or the tip of the firing pin, push out the extractor pin. from either side.
3. Remove the extractor from the bolt.
Retaining Pin
Extractor
FIG 29 BOLT WITH EXTRACTOR REMOVED
NOTE: Only separate the extractor spring from the extractor when replacement is necessary
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7.3. Hand Guard Removal
CAUTION: DO NOT REMOVE THE HAND GUARD ASSEMBLY UNLESS THE UPPER AND LOWER RECEIVERS ARE SEPARATED.
REMOVAL OF THE HAND GUARD WILL EXPOSE THE GAS TUBE ASSEMBLY. SHOULD THE RIFLE FALL OR STRIKE A HARD
SURFACE, THE GAS TUBE COULD BE DAMAGED EFFECTING OPERATION OF THE RIFLE. SEPARATING THE RECEIVERS
REDUCES THE OVERALL WEIGHT OF THE RIFLE REDUCING THE RISK OF DAMAGE SHOULD THE RIFLE FALL OR STRIKE A
HARD OBJECT OR SURFACE.
FIG 31 EXPLODED VIEW OF HAND GUARD
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7.4. Removal of Recoil Buffer and Action Spring
REMOVAL OF THE RECOIL BUFFER AND SPRING IS EASIER IF THE
HAMMER IS IN THE COCKED POSITION AND THE FIRE CONTROL
SELECTOR IS ROTATED TO THE SAFE POSITION. ALWAYS WEAR SAFETY
GLASSES WHEN HANDLING PARTS UNDER SPRING TENSION.
1. Depress buffer retaining plunger while maintaining control the buffer
as you allow it to move forward from the receiver extension tube.
FIG 37 PICTURE OF THUMB OVER BUFFER ASSEMBLY
2. Guide the buffer and action spring from the receiver extension.
3. Use a clockwise twisting motion to separate the action spring from the recoil buffer.
Do NOT pull straight back on the action spring as it can cause damage to the spring.
FIG 38 BUFFER AND RECOIL SPRING REMOVAL
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8.0. Cleaning
1. Your rifle is delivered factory packaged and preserved with a light coating of protective grease and oils. Before
loading make certain that all packing grease and oil has been cleaned from the bore and exposed mechanism.
2. Before you begin to disassemble your firearm for cleaning, always double-check to make sure it is unloaded!
3. After cleaning always check to be sure that no cleaning patch or other obstruction remains in the bore or chamber!
ONLY USE CLEANING AND LUBRICATION PRODUCTS THAT ARE SPECIFICALLY DESIGNED FOR USE ON FIREARMS.
DO NOT USE WIRE BRUSHES ON ALUMINUM SURFACES SUCH AS THE RECEIVERS OR QUAD RAILS AS THIS MAY SCRATCH
THE FINISH.
READ ALL WARNING LABELS AND OBTAIN MSDS ON ANY CLEANING, LUBRICATION, AND PROTECTIVE CHEMICALS USED.
CLEANER, LUBRICANT, PROTECTANT IS COMMONLY REFERRED TO AS “CLP”
SOME BORE CLEANERS ARE NOT MEANT TO BE LEFT IN THE BORE FOR EXTENDED PERIOD OF TIME.
FOLLOW ALL MANUFACTURER’S INSTRUCTIONS AND CAUTIONS WHEN USING CLEANING OR LUBRICATION PRODUCTS ON
FIREARMS.
SOLVENT IS A GENERIC TERM AND WILL BE USED TO DESCRIBE A GENERAL BORE CLEANING SOLUTION.
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8.1. Cleaning the Bore
1. Run a patch soaked in solvent through the bore.
2. Allow the solvent to soak in the barrel for at least 5 minutes.
3. Move on to section 8.3 and clean the bolt while the solvent works on loosening the residue in the bore of the barrel.
4. If the barrel is heavily fouled use a cleaning rod and a brass or nylon bore brush of the proper bore diameter and clean
the bore from the chamber end to the muzzle end. Pass the brush completely out past the muzzle and do not change
direction in the bore as the brush can become stuck in the bore.
5. Run cotton patches through the bore until the patches come out clean. The bore and chamber of the barrel may be
lightly lubricated with an oily patch if the rifle is to be stored. Upon returning the rifle to service you must remove the oil
by running a dry patch through the barrel.
8.2. Cleaning Chamber
Keep muzzle pointed upward to keep chamber residue from running down into the cleaned bore.
1. Use a chamber brush coated in solvent to clean chamber.
2. Use a minimum of five (5) plunge strokes and three (3) 360 degree clockwise rotations.
3. Clean residue with cotton patches, swabs or a chamber mop.
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8.3. Cleaning the Bolt
A cotton patch or a soft toothbrush and solvent can be used to complete the following steps:
1. Clean all fouling from around the bolt locking lugs.
2. Clean all fouling from bolt body
3. Clean extractor and the extractor slot in the bolt.
4. Use pipe cleaner to clean firing pin channel.
8.4. Cleaning the Bolt Carrier
1. Clean all fouling from bolt carrier body.
2. Clean the bolt channel in the front of the carrier with a brush or cotton swabs.
8.5. Cleaning Action Spring and Receiver Extension
1. Clean with rag and solvent.
2. Wipe dry.
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8.6. Cleaning the Magazine
Magazines should be cleaned whenever the rifle is cleaned as preventive maintenance.
FIG 39 MAGAZINE
1. Use a brush to clean inside the body.
2. Clean with a rag and CLP then wipe dry.
3. Clean follower and dry completely.
The magazine body should be kept dry. Any oil or solvent left behind will attract dirt and debris causing undue wear and
possibly feeding issues.
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9.0 Reassembly
9.1. Recoil Buffer and Action Spring
1. Slide the action spring over the recoil buffer and snap it into place by using a clockwise twisting motion as you press it
forward.
FIG 40 SPRING TO BUFFER
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2. Insert the action spring into the receiver extension tube.
FIG 41 ACTION SPRING AND BUFFER
STARTED INTO RECEIVER EXTENSION
3. Push the recoil buffer back into the receiver extension until the buffer retaining plunger engages the face of the buffer
and holds it into the receiver extension.
FIG 42 BUFFER HELD INTO RECEIVER
EXTENSION
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9.2. Extractor
1. Fit extractor to bolt body by holding bolt in one hand; and
2. While applying pressure with thumb over the spring end of the extractor, slide extractor pin into hole until ends are
flush with bolt body.
FIG 43 EXTRACTOR TO BOLT BODY
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9.3. Bolt to Bolt Carrier
WARNING:
THE BOLT CAM PIN MUST BE INSTALLED OR THE RIFLE WILL SUFFER A CATASTROPHIC FAILURE WHICH COULD RESULT IN
SERIOUS INJURY OR DEATH TO THE OPERATOR.
DO NOT INTERCHANGE BOLT ASSEMBLIES FROM ONE RIFLE TO ANOTHER. DOING SO COULD RESULT IN SERIOUS INJURY
OR DEATH TO THE OPERATOR.
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1. Re-insert the bolt into the bolt carrier with the extractor oriented to the right side of the bolt carrier; and
FIG 44 ALIGN BOLT INTO CARRIER BODY
2. Pull the bolt forward to the unlocked position; and align
the cam pin hole inserting the cam pin into the bolt; and
3. Insert the firing pin into the tail shaft of the bolt.
FIG 45 CAM PIN BACK INTO BOLT AND CARRIER
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CAUTION: THE FIRING PIN MUST BE FULLY INSERTED INTO THE BOLT CARRIER PRIOR TO INSTALLATION OF THE FIRING PIN
RETAINING PIN. THE RETAINING PIN MUST PASS BETWEEN THE LARGE SHOULDER OF THE FIRING PIN AND THE HEAD OF
THE FIRING PIN.
FIG 46 FIRING PIN INSERTED INTO BOLT/CARRIER
4. Re-install the firing pin retaining pin into the bolt carrier from left to right.
5. Point the bolt carrier assembly with the bolt face upward and ensure the firing pin is properly retained in the carrier by
lightly slapping the bolt face back into the carrier (locked position). The firing pin should NOT fall out of the carrier.
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9.4. Bolt Carrier Assembly to Upper Receiver
1. Position the upper receiver assembly with the open bottom facing upward; and
2. Insert the charging handle into the slotted key way of the receiver and push it forward slightly.
3. Take the bolt carrier assembly with the bolt pulled completely forward (unlocked position) and set it into the charging
handle.
4. Simultaneously push the bolt carrier assembly and the charging handle forward until the bolt and the charging handle
lock into place.
FIG 47 REINSTALLATION OF THE BOLT CARRIER ASSEMBLY TO UPPER RECEIVER
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9.5. Rejoining Upper and Lower Receivers
To aid in steps 1-3, manually cock the hammer by pushing it down until it is held in place then rotate the fire control
selector to SAFE.
1. Position the upper and lower receivers to align the pivot pin (front pin) holes.
2. Push the pivot pin from right to left until the head of the pivot pin is flush against the receiver. You will feel it captured
by the detent pin.
3. Close the receivers together and push the takedown pin (rear pin) from right to left until the head of the takedown pin
is flush against the receiver. You will feel it captured by the detent pin as you did the pivot pin.
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10.0. Perform a Function Check of the SIG M400 Semi-Automatic Rifle
With the SIG M400 rifle and one UNLOADED magazine perform a function check of the rifle as outlined below in steps
1-13.
THE FUNCTION CHECK SHOULD ALWAYS BE DONE AFTER CLEANING AND ASSEMBLING THE RIFLE. ALWAYS VISUALLY
AND PHYSICALLY CLEAR THE FIREARM FIRST!
SIG M400 (SAFE/SEMI ONLY)
1. Insert an empty magazine into the magazine well until it locks into place.
2. Pull down on the magazine to ensure it is locked in place by the magazine catch.
3. Pull charging handle fully back then push it forward into locked position. The bolt carrier should now be held to the
rear by the bolt catch.
4. Depress the magazine catch .
5. The magazine should fall free of the rifle under its own weight (unloaded).
6. Push the top of bolt catch to release the bolt carrier. The bolt carrier will travel forward into the locked position.
7. Rotate the fire control selector to SAFE.
8. Press the trigger to the rear. The hammer should NOT fall.
9. Rotate the fire control selector to SEMI.
10. Press the trigger to the rear and DO NOT RELEASE IT. You should hear a loud click as the hammer falls. Keep the
trigger pressed to the rear; and
11. Pull the charging handle to the rear and release it while keeping trigger pulled. Hammer should not fall but be held
in the cocked position by the disconnect.
12. Release the trigger. A click should be heard as the hammer is caught by the trigger sear.
13. Press the trigger to the rear again and the hammer should fall.
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11.0 Lubrication
Using lubricant designed for use on firearms, lightly apply to the contact areas of the following components:
Upper Receiver Assembly
• Forward assist.
• Ejection port cover spring and latch.
• Charging handle latch and spring.
• Front sight detent.
• Rear sight windage screw and detent.
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Bolt and Carrier Assembly
• Extractor spring.
• Tailshaft
• Cam Pin.
• Bolt Rings.
• Locking Lugs.
• Rail Surfaces, top and bottom.
• Bolt bearing surface.
Lower Receiver Assembly
• Fire control springs, pins, detents, pivot and takedown pins.
• Trigger Sear Surface, Disconnect Surface.
• Buttstock release levers.
• Recoil buffer
• Action spring
• Receiver extension
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12.0 Transportation and Storage
When transporting your firearm to and from shooting activities, keep it unloaded for your safety and for the safety
of others. When storing your firearm, keep it separated from ammunition, under lock and key if possible, and out of the
reach of children and other inexperienced or unauthorized persons.
WARNING - STORAGE:
Never place or store any firearm in such a manner that it may be dislodged. Firearms should always be stored securely
and unloaded, away from children and other unauthorized users. Use the locking device originally supplied with this
firearm for storage. The use of a locking device or safety lock is only one aspect of responsible firearms storage. For
increased safety, firearms should be stored unloaded and locked in a location that is both separate from their ammunition
and inaccessible to children and any other unauthorized person.
STORE SECURELY & UNLOADED
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13.0. Service and Replacement Parts Policy
Parts Policy
Our Service Department maintains a full complement of replacement parts. Even though most gunsmiths have the
knowledge, training, and the ability to make necessary repairs to your firearm, the skill and workmanship of any
particular gunsmith is totally beyond our control.
Should your firearm ever require service, we strongly recommend that you return it to SIG SAUER Inc. A firearm is a
precision instrument and some replacement parts will require individual fitting to ensure correct operation. A wrong part,
improper fitting, or incorrect mechanical adjustment may result in an unsafe condition or dangerous malfunction, damage
to the firearm, or cause possible serious injury to the shooter or others.
IF ANY PART IS ORDERED WITHOUT RETURNING THE FIREARM TO SIG SAUER Inc., the customer bears full responsibility
for ensuring that the part supplied is correct for their particular firearm and is properly installed and fitted by a qualified
gunsmith.
SIG SAUER Inc. CANNOT BE RESPONSIBLE FOR THE FUNCTIONING OF ANY FIREARM IN WHICH REPLACEMENT PARTS ARE
INSTALLED BY OTHERS.
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WARNING - PARTS PURCHASE:
It is the purchaser’s responsibility to be absolutely certain that any parts ordered from the factory are correctly fitted
and installed. Firearms are complicated mechanisms and IMPROPER FITTING OF PARTS MAY RESULT IN A DANGEROUS
MALFUNCTION, DAMAGE TO THE FIREARM, AND SERIOUS INJURY TO THE SHOOTER AND OTHER PERSONS. The purchaser
and installer of parts must accept full responsibility for the correct adjustment and functioning of the rifle after such
installation.
PARTS MUST FIT CORRECTLY
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Service Policy
If you have questions concerning the performance or servicing of your rifle, please write or call:
SIG SAUER Inc.
Attention: Customer Service
18 Industrial Drive, Exeter, NH 03833
Phone: (603) 772-2302
Fax: (603) 772-9082
IF YOU DO NOT UNDERSTAND THE INSTRUCTIONS FOR OPERATING YOUR RIFLE, IT IS YOUR RESPONSIBILITY TO CALL OUR
CUSTOMER SERVICE DEPARTMENT AT (603) 772-2302 BEFORE USING YOUR RIFLE.
14.0. Shipping Firearms for Repair
Returning Your Firearm For Service In the event you need to return your rifle to the SIG SAUER
Service Department, here’s what to do:
1. The first step is to contact Customer Service at (603) 772-2302 for an RMA number. This number allows SIG SAUER to
track the status of your return from its receipt at SIG SAUER through its return to you. Please do not send your firearm
until you obtain an RMA number.
2. Make sure that the chamber and magazine(s) are unloaded and that no ammunition is included with your returned
firearm.
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3. Package the firearm securely to prevent damage. Enclose a letter which includes your name, street address, daytime
phone number, model and serial number, and a detailed description of the problem you have experienced or the work
you want performed. With the exception of extra magazines, do not include scopes, mounts, or other accessories.
4. Generally, an individual may ship firearms to the manufacturer for repair or service. Some states and localities,
however, prohibit this. If you live in such an area, the firearms must be shipped by and returned to a Federally Licensed
Firearms Dealer.
5. Federal law prohibits persons who do not possess a Federal Firearms License from shipping a firearm via the U.S.
Postal Service. (Note: any shipment of firearms outside U.S. borders is subject to the export laws of the United States and
to the valid laws of the specific country, which you must strictly follow; prior to exporting any firearm you should seek
legal counsel.)
6. SIG SAUER is not responsible for any firearm until it is received, nor for damage incurred during shipment.
7. Ship your firearms insured and prepaid (we do not accept collect shipments) to:
SIG SAUER Inc.
Attention: Service Department
18 Industrial Drive Exeter, NH 03833
This instruction manual should always accompany this rifle and be transferred with it upon change of ownership.
WARNING: BEFORE SHIPPING ANY FIREARM, BE ABSOLUTELY CERTAIN THAT THE FIREARM AND ITS MAGAZINE ARE
UNLOADED. DO NOT SHIP AMMUNITION WITH A FIREARM.
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ORDER PARTS
In the event you want to order parts for your SIG M400 rifle, contact Customer Service at (603) 772-2302. Have available
the serial number of your rifle and the part diagram number for the part(s) you wish to order.
15.0 Parts Diagram
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16.0 Parts List
UPPER RECEIVER PARTS LIST
1 UPPER RECEIVER ASSEMBLY
2 HANDGUARD ASSEMBLY
3 TUBE,BENT,METALLIC
4 BARREL ASSEMBLY
5 SHIM COMPENSATOR
6 COMPENSATOR
7 PIN,SPRING ,GAS TUBE
8 RING,SLIP,HAND GUAR GUARD
9 SPRING,SLIP RING,HANDGUARD UPPER RECEIVER
10 RETAINING RING
LOWER RECEIVER AND BUTTSTOCK PARTS LIST
1 SPRING, HELICAL, COMP ACTION
2 BUFFER ASSEMBLY
3 HAMMER ASSEMBLY
4 SEAR
5 SELECTOR, FIRE CONTROL
6 SPRING, HELICAL, COMP COMPRESSION, BOLT CATCH
7 PLUNGER, BOLT CATCH
8 CATCH, BOLT
9 PIN, SPRING , BOLT CATCH
10 CATCH, MAGAZINE
11A SPRING, HELICAL, COMP COMPRESSION
12 PIN, STRAIGHT, HEADLE DETENT, TAKEDOWN PIN
13 SPRING, HELICAL, COMP COMPRESSION, MAGAZINE CATCH
14 BUTTON, MAGAZINE CAT CATCH
15 PIN, GROOVED, HEADED (PIVOT PIN)
16 LEVER, LOCK-RELEASE SEMI
17 LEVER, LOCK-RELEASE , BURST
18 TRIGGER ASSEMBLY
19 GRIP, RIFLE PLASTIC, BLACK
20 WASHER, LOCK , RIFLE GRIP
21 SCREW, MACHINE , RIFLE GRIP
22 SPRING, HELICAL, COMP SAFETY
23 DETENT, SAFETY
24 PIN, GROOVED, HEADLES TRIGGER AND HAMMER
25 PIN, GROOVED, HEADLES , AUTOMATIC SEAR
26 PIN, GROOVED, HEADED
27 SPACER, STEPPED
28 BUTTSTOCK ASSEMBLY
29 SCREW, MACHINE , BUTTCAP (M16A2
30 LOWER RECEIVER AND RECEIVER EXTENSION ASSEMBLY
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SIG SAUER® Limited Lifetime Firearms Warranty
SIG SAUER warrants that the enclosed firearm was originally manufactured free of defects in material, workmanship and
mechanical function. For the lifetime of the original purchaser, SIG SAUER agrees to correct any defect in the firearm
for the original purchaser by repair, adjustment or replacement, at SIG SAUER’s option, with the same or comparable
quality components (or by replacing the firearms at SIG SAUER’s option); provided, however, that the firearm is returned
unloaded and freight prepaid to SIG SAUER at 18 Industrial Drive, Exeter, NH 03833.
This limited warranty is null and void if the firearm has been misused, damaged (by accident or otherwise), fired with
handloaded, reloaded or improper ammunition, fired with an obstruction in the barrel, damaged through failure to provide
reasonable and necessary maintenance as described in the manual accompanying the firearm, or if unauthorized repair
or any alteration, including of a cosmetic nature, has been performed on the firearm. This limited warranty does not apply
to normal wear and tear of any parts.
Subject to the foregoing, this limited warranty confers the right to have the covered firearm or its parts repaired, adjusted
or replaced exclusively upon the original purchaser, which right is not transferable to any other person. No implied
warranties of any kind are made herein and this warranty does not apply to any accessory items attached or appurtenant
to the firearm. In no event shall SIG SAUER be liable for any incidental or consequential damages arising from or in
connection with this limited warranty.
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Notes:
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For Product Service on this model,
Please Call (603) 772-2302
18 Industrial Drive, Exeter, NH 03833 USA
P/N 1700688
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