SIG SAUER SIG556xi User Manual
®
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.
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:
State-By-State Warnings
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.”
CONNECTICUT:
“UNLAWFUL STORAGE OF A LOADED FIREARM MAY RESULT IN IMPRISONMENT OR FINE.”
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.”
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.”
NEW JERSEY:
“IT IS A CRIMINAL OFFENSE TO LEAVE A LOADED FIREARM WITHIN EASY ACCESS OF A MINOR.”
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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.
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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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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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® rifle 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) 610-3400
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 ................................................................2-4
The Basic Rules of Safe Firearms Handling ................................................. 5
Locking Device ......................................................................... 6
General Safety Information and Mechanical Characteristics ................................... 13
1.0 Safety Information .................................................................. 13
1.1. Protect Your Eyes And Ears ..................................................... 14
2.0 Mechanical Characteristics and Weapon Theory .......................................... 14
2.1. Weapon Description ............................................................ 14
2.1.1 General ..................................................................... 14
2.1.2 Barrel With Receiver And Gas System ............................................. 15
2.1.3 Bolt ......................................................................... 16
2.1.4 Handguards .................................................................. 17
2.1.5 Trigger Casing Assembly And Butt Stock .......................................... 18
2.1.6 Gas Valve Position ............................................................20
2.1.7 Butt Stock Operation .......................................................... 22
2.1.8 Sights ....................................................................... 23
BUIS Installation ................................................................... 24
2.1.10 Magazine ................................................................... 26
Operation of Safety .................................................................... 26
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Topic Page
Operation of Safety in Select Fire Version .................................................. 28
The Bolt Catch Lever .................................................................. 32
Ammunition .......................................................................... 33
To Load and Fire (With Magazine) ........................................................ 37
3.0 Handling .......................................................................... 37
3.1 Important Instructions ........................................................... 37
3.2 Loading The Rifle ............................................................... 38
3.3 Loading The Magazine ........................................................... 39
3.4 Changing the Magazine .......................................................... 39
3.5 Reloading ..................................................................... 40
To Unload Magazine and Rifle ............................................................ 43
4.0 Unloading ......................................................................... 43
To Extract and Eject a Chambered Cartridge ............................................ 45
To Clear a Malfunction (“Jam”) ...................................................... 46
5.0 Procedures In Case Of Malfunction .................................................... 46
To Minimize Malfunctions (“Jams”) ................................................... 48
6.0 Field Strip Disassembly .............................................................. 49
6.1 Reassembly ................................................................... 56
6.2 Function Check ................................................................ 61
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Topic Page
Magazine Inspection and Care ........................................................... 63
Care and Cleaning ...................................................................64
Transportation & Storage ................................................................ 64
7.0 Sight Options ...................................................................... 65
Troubleshooting ....................................................................... 66
8.0 Maintenance ....................................................................... 68
8.1 Cleaning ...................................................................... 69
Service and Parts Policy ...............................................................73
Shipping Firearms for Repair ............................................................ 74
Ordering Parts ....................................................................... 75
9.0 Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
9.1 SIG556xi Select Fire Upper Parts List & Diagram ...................................... 78
9.2 SIG556xi Select Fire Lower Parts List & Diagram ...................................... 80
Warranty Information ................................................................. 82
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WARNINGS OF GREAT IMPORTANCE
ARE FOUND WITHIN THIS MANUAL
Locking Devices 6
Alterations 12
Sights 25
Manual Safety 33
Ammunition 33, 36
Lead Exposure 36
Handling 37, 42
OTHER CAUTIONS AND WARNINGS APPEAR THROUGHOUT THE MANUAL
Loading 38
Firing 42
Unloading 44
Storage 65
Parts Purchasers 72
Shipping 75
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. to be compatible
with this firearm.
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 a greater level of 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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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.
2.0. Mechanical Characteristics and Weapon Theory
2.1 Weapon Description
2.1.1 General
The SIG556xi Rifle is a gas operated firearm with a rotary bolt mechanism capable of semi-automatic, or automatic operation.
Semi-automatic means one round will fire each time the trigger is pulled until the magazine is emptied of ammunition.
Automatic means the rifle will continue to fire as long as the trigger is depressed or the magazine is emptied of ammunition.
The rifle is designed to be chambered in 5.56mm NATO, 7.62x39mm or .300 Blackout. Use only ammunition of the caliber for
which your firearm is chambered.
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2.1.2 Barrel With Receiver And Gas System
The barrel is mechanically mated to the receiver. The flash suppressor is screwed onto the muzzle end of the barrel which
features a 0.5 x 28 TPI thread pattern. The gas block, which is fixed on the barrel, contains the gas port, locates the gas system
(gas tube and operating rod), accepts the front sight and also serves as support for the handguards. The receiver guides the
bolt and bolt carrier, and houses the locking system. An accessory mounting rail is fixed to the upper part of the receiver,
providing an attachment point for sighting systems and other accessories.
1 2 3 4 5 6 7
8 9 10 11 12 13 14 15
1 Accessory Rail
2 Bolt Cover
3 Charging Handle Catch
4 Gas Tube
5 Operating Rod
(inside gas tube
6 Front Sight Rail
7 Gas Valve
8 Takedown Pin Hole
9 Receiver
10 Bolt & Bolt Carrier (hidden)
11 Pivot Pin Hole
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12 Barrel Nut
13 Barrel
14 Gas Block
15 Flash Suppressor
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2.1.3 Bolt
The bolt consists of two main parts:
• Bolt Carrier
• Bolt Head
a. Bolt Carrier: The bolt carrier guides the bolt head, controls the locking and unlocking by means of the cam, holds the
operating rod, and cocks the hammer.
b. Bolt Head: The bolt head locks the bolt assembly, houses the firing pin and extractor and feeds the cartridges from the
magazine to the chamber.
BOLT CARRIER BOLT HEAD
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2.1.4 Handguards
The handguards protect the barrel and the gas system from damage and provide protection from burning. The integrated
accessory mounting slots provide attachment points for various devices once 1913 rail sections are attached, , such as lights,
lasers, sights, and bipods.
ALUMINUM HANDGUARD
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2.1.5 Trigger Casing Assembly and Butt Stock
The trigger casing assembly contains the internal components of the firing and safety mechanisms, bolt catch, magazine well,
magazine release, and butt stock assembly.
The safety lever, located on both sides of the trigger casing, can be set to three positions (Auto or 2 position Semi-only):
Position “S”: The weapon is locked in the safe position.
Position “F”: The weapon will fire semi auto.
Position “A”: The weapon fires in the full auto mode.
TAKEDOWN PIN
SAFETY
LEVERS
MAGAZINE WELL
BUTT STOCK RIFLE GRIP TRIGGER TRIGGER GUARD
PRESSURE POINT SCREW
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MAGAZINE
RELEASE
PIVOT PIN
LEFT SIDE
SAFETY LEVERS
WARNING – Be careful of accidental discharges when inserting gloved fingers into the trigger guard.
The SIG556xi rifle is equipped with a side folding stock, featuring integral sling attachment points.
CHEEK REST
SLING ATTACHMENT
RECOIL PAD
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2.1.6 Gas Valve Position
The gas volume required for the function of the SIG556xi rifle can be controlled by the gas valve. The gas valve has three
positions:
a. Position 1 (Rib of gas valve in vertical position).
Under normal conditions, the gas valve should remain in Position 1. This will give the best all-around performance and
function.
b. Position 2 (Rib of gas valve in the slanted position).
c. Position 3 (Suppressed Setting)
POSITION 1 - RIB VERTICAL
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POSITION 2 - RIB SLANTED POSITION 3 - SUPPRESSED
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If cycling or ejection problems are encountered due to heavy fouling, the gas valve can be moved to Position 2 by rotating
clockwise as far as the stop. In this position, a larger gas volume is released against the operating rod. The need to use the
gas valve in Position 2 is an indication that the rifle requires cleaning.
CAUTION
In the case of a hot or heavily fouled weapon, use a cartridge or auxiliary aid to prevent burns to your fingers.
-
NOTICE
Firing with the gas valve in Position 2 is an exception. As soon as normal function returns, the gas valve must
-
be returned to Position 1. Continued operation with the gas valve in Position 2 will increase recoil and
place unnecessary stress on the rifle. The rifle should be cleaned as soon as conditions permit.
WARNING
- Always ensure the rifle is unloaded and clear of ammunition when
manipulating the gas valve.
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2.1.7 Butt Stock Operation
1. The butt stock provides for easy adjustment of length to accommodate the individual shooter or for storage.
2. To fold the stock, depress the latch on the left side of the rifle unlocking the stock. Fold the stock to the right until it latches
on the hook located at the rear of the handguard. Ensure the stock is locked prior to firing the rifle in this configuration.
2.1.8 Sights
STOCK LATCH
CLAW HOOK
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Front Sight Elevation Adjustment
Elevation adjustments are made to the front sight upon initial zeroing of the rifle. An M16A2/
M4 type front sight tool can be used to make sight adjustments.
Rotating the front sight post clockwise lowers the front sight post resulting in the impact of the
bullet to move upward on the target.
Rotating the front sight counterclockwise raises the front sight post resulting in the impact of
the bullet to move downward on the target.
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BUIS Installation on the SIG556xi
The SIG556xi is equipped with the SIG BUIS. This rear sight offers a rapid adjustment for range and an additional knob for windage. It also allows for a battesight zero to be set by the operator.
To Install:
1. The sight must be mounted in the second to last slot of the top M1913 Rail.
2. Set the sight in the rail slot with the windage knob to the right/range scale to the left.
3. Pull the sight back rearward in the slot until it stops.
4. Tighten the retaining screw until snug then an additional ¼ turn using an 1/8” hex wrench.
To Zero the BUIS:
Use an M4 25m zero target at a known distance of 25m:
1. Turn the range knob to 300m (Do not use the fine line between 300 and 400
as this is for a rifle length sight radius).
2. Fire a three round shot group.
3. Correct elevation with the front sight post.
4. Correct windage with the windage knob on the BUIS
5. Re-fire another 3 round group and make corrections.
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WARNING - SIGHTS
Do not adjust or otherwise manipulate any sight system on the rifle without first confirming the
magazine is removed, the safety lever is on “SAFE” and the rifle is fully unloaded.
Failure to heed this warning could result in unintentional discharge, resulting in injury or death.
UNLOAD RIFLE BEFORE MANIPULATING SIGHTS.
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2.1.10 Magazine
The Rifle ships with one (1) 30-round magazine. The SIG556xi is compatible with M16/AR-15 type magazines. The 556xi Russian
will use most AK47 type magazines.
OPERATION OF SAFETY
The SIG556xi has a manual safety which is located on the left and right side of the trigger casing, just forward of the rifle grip
and above the trigger. The safety levers may be operated from either side.
SAFETY LEVER
(RIGHT SIDE OF RIFLE)
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