SIGM400
when it counts
™
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 fi rearm and be transferred with it upon
ownership, or when the fi rearm is loaned or presented to another person.
OWNERS MANUAL: HANDLING & SAFETY INSTRUCTIONS
™
when it counts
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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: Epping, New Hampshire
Satellite Facilities: 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 Warnings 2-5
Locking Device 6
General Safety Information and Mechanical Characteristics 14
Basic Rules of Safe Firearms Handling 15
1.0 Safety Information 14
1.1 Protect your Eyes and Ears 16
1.2 Ammunition 16
2.0 Mechanical Characteristics and Rifle Theory 21
2.1 Rifle Description 21
2.1.1 General 21
2.1.2 Barrel with Receiver and Gas System 21
2.1.3 Bolt and Bolt Carrier Assembly 22
2.1.4 Hand Guard 23
2.1.5 Lower Receiver and Buttstock Assembly 24
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Topic Page
2.1.7 Buttstock Operation 26
2.1.8 Trigger Guard Operation 30
2.1.9 Sights 32
2.1.10 Magazine 39
2.2 Technical Specification 40
2.2.1 Operation of Fire Control Selector /Safety 41
3.0. Handling 43
3.1 Important Instructions 43
3.2 Loading the Magazine 44
3.3 Loading the Rifle 45
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 Operation 48
4.1 Firing 49
4.1.1 Unlocking of the Bolt, Extraction, and Ejection 49
4.1.2 Cocking of the Hammer 50
4.1.3 Chambering and Locking 50
5.0 Unloading 51
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Topic Page
6.0 Procedures in case of a Stoppage 52
6.1 Failure to Fire (Cold Rifle) 52
6.2 Failure to Fire (Hot Rifle) 53
7.0 Field Strip Disassembly 55
7.1 Detailed Disassembly of the Bolt Carrier and Bolt 56
7.2 Extractor Removal 57
7.3 Hand Guard Removal 58
7.4 Removal of Recoil Buffer and Action Spring 59
8.0. Cleaning 60
8.1 Bore 61
8.2 Chamber 61
8.3 Bolt 62
8.4 Bolt Carrier 62
8.5 Action Spring and Receiver Extension 62
8.6 Magazine 63
9.0. Reassembly 64
9.1. Recoil Buffer and Action Spring 64
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Topic Page
9.2 Extractor 66
9.3 Bolt to Bolt Carrier 67
9.4 Bolt Carrier to Upper Receiver 70
9.5 Rejoining Upper and lower Receivers 71
10.0 Perform a Function Check 72
11.0 Lubrication 73
12.0 Transportation and Storage 75
13.0 Service and Replacement Parts Policy 76
14.0 Shipping Firearms for Repair 78
15.0 Parts Diagram 80
16.0 Parts List 81
SIG SAUER Limited Lifetime Firearms Warranty 84
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WARNINGS OF GREAT IMPORTANCE
ARE FOUND WITHIN THIS MANUAL
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.
Locking Devices 6
Alterations 13
Manual Safety 25
Ammunition 17, 20
Lead Exposure 20
Handling 43
Loading 45
Firing 48
Storage 75
Parts Purchasers 77
Shipping 79
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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 - 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
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
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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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Bolt Rings
Extractor
Ejector
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.
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.
FIG 3 BOLT ASSEMBLY
Bolt
Bolt Carrier
Cam Pin
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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.
Magazine release
Fire control selector
Sling attachment point
Bolt Catch Lever
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.
FIG 7 BUTT STOCK
Release Latch
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