Sigsauer SIG 556 Instruction Manual
SIG 556
SEMI-AUTOMATIC RIFLE
5.56mm NATO (.223 Remington)
READ THE INSTRUCTIONS
AND WARNINGS IN THIS
MANUAL CAREFULLY BEFORE
USING THIS FIREARM; DO
NOT DISCARD THIS MANUAL.
For Product Service On This Model Please Call (603) 772-2302
SIGARMS Inc. 18 Industrial Drive, Exeter, New Hampshire 03833
THIS INSTRUCTION MANUAL SHOULD ALWAYS ACCOMPANY THIS FIREARM AND BE
TRANSFERRED WITH IT UPON CHANGE OF OWNERSHIP, OR WHEN THE FIREARM IS LOANED
OR PRESENTED TO ANOTHER PERSON.
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. SIGARMS, Inc.
sells its products in compliance with applicable laws and regulations. Because
our products may be sold 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 armas
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 siempre
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
SIG 556 Operators Manual 1 P/N 1511203 VER 12.7.3
OWNERSHIP OR POSSESSION OF A FIREARM TO A
MINOR OR A PERSON OF UNSOUND MIND.”
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.”
SIG 556 Operators Manual 2 P/N 1511203 VER 12.7.3
“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.”
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:
“IT IS UNLAWFUL TO STORE OR LEAVE A FIREARM
THAT CAN BE DISCHARGED IN A MANNER THAT A
REASONABLE PERSON SHOULD KNOW IS ACCESSIBLE
TO A MINOR.”
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.”
SIG 556 Operators Manual 3 P/N 1511203 VER 12.7.3
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.
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 inside the
trigger guard or in any way that it can possibly
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. Guns should be
stored unloaded
from their ammunition.
, in a secure location, separate
NEVER INSTALL THE
LOCKING DEVICE INSIDE
THE TRIGGER GUARD
SIG 556 Operators Manual 4 P/N 1511203 VER 12.7.3
TABLE OF CONTENTS
Topic Page
State-By-State Warnings
Locking Device
General Safety Information and Mechanical Characteristics
1.0. Safety Rules
1.1. Protect Your Eyes And Ears
2.0. Mechanical Characteristics and Weapon Theory
2.1. Weapon Description
2.1.1. General
2.1.2. Barrel With Receiver And Gas System
2.1.3. Bolt
2.1.4. Hand Guards
2.1.5. Trigger Casing Assembly And Butt Stock
2.1.6. Gas Valve Position
2.1.7. Butt Stock Operation
2.1.8. Trigger Guard Operation
2.1.9. Sights
2.1.10. Magazine
2.2. Technical Specifications
Operation of Safety
The Bolt Catch Lever
Ammunition
To Load and Fire (With Magazine)
3.0. Handling
3.1. Important Instructions
3.2. Loading The Weapon
3.3. Loading The Magazine
3.4. Changing the Magazine
3.5. Reloading
4.0. Ready to Fire
4.1. Firing
4.1.1. Unlocking Of Bolt, Extraction, & Ejection
4.1.2. Bolt Advance
1
4
8
8
8
9
9
9
9
10
10
11
12
13
14
15
18
18
19
21
22
26
26
26
27
27
28
28
29
30
31
32
SIG 556 Operators Manual 5 P/N 1511203 VER 12.7.3
To Unload Magazine and Rifle
5.0. Unloading
To Extract and Eject a Chambered Cartridge .
To Clear a Malfunction (“Jam”)
6.0. Procedures In Case Of Malfunction
To Minimize Malfunctions (“Jams”)
To Disassemble
7.0. Field Strip Disassembly
To Reassemble
7.1. Reassembly
7.2. Function Check
Magazine Inspection and Care
Care and Cleaning
Storage .
8.0. Sight Options
Maintenance
9.0. Maintenance
9.1. Cleaning
Service and Parts Policy
Shipping Firearms for Repair
Ordering Parts
10.0. Parts List
10.1. Parts Diagram
The Basic Rules of Safe Firearms Handling
Warranty Information
Notes
36
36
37
38
38
40
40
40
44
44
47
48
49
49
50
51
51
51
52
54
55
56
57
58
59
60
SIG 556 Operators Manual 6 P/N 1511203 VER 12.7.3
WARNINGS OF GREAT IMPORTANCE ARE FOUND ON
THE FOLLOWING PAGES:
Locking Devices 4 Handling 24
Alterations 7 Handling 33
Manual Safety 18 Firing 33
Lead Exposure 23 Unloading 35
Ammunition 23 Storage 48
Loading 24 Parts Purchasers 51
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.
WARNING - ALTERATION
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
Sigarms, Inc.
DO NOT ALTER ANY GUN
SIG 556 Operators Manual 7 P/N 1511203 VER 12.7.3
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.
SIGARMS, 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 SIGARMS,
Inc. be liable for incidental or consequential damages, such as
loss of use of property, commercial loss, and loss of earnings or
profits.
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
SIG 556 Operators Manual 8 P/N 1511203 VER 12.7.3
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 SIG 556 Rifle is a semi-automatic, gas operated weapon,
with a rotary bolt mechanism. Semi-automatic means one round
will fire each time the trigger is pulled until the magazine is
emptied of ammunition. The rifle is chambered in 5.56mm
NATO and is compatible with .223 Remington ammunition.
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 ½ 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 an optional front sight and
also serves as support for the hand guards. 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.
SIG 556 Operators Manual 9 P/N 1511203 VER 12.7.3
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.
2.1.4. Hand Guards
The hand guards protect the barrel and the gas system from
damage and provide protection from burning. The integrated
accessory mounting rails provide attachment points for various
devices, such as lights, lasers, sights, and bipods.
SIG 556 Operators Manual 10 P/N 1511203 VER 12.7.3
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 two positions:
• Position "S:" The weapon is locked in the safe position.
• Position "F:" The weapon will fire in the semi-automatic mode.
SIG 556 Operators Manual 11 P/N 1511203 VER 12.7.3
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, and after firing should be immediately returned
to the normal (closed) position.
CAUTION: Be careful of accidental discharges when inserting
gloved fingers into the trigger guard.
The SIG 556 rifle
is equipped with a
collapsible stock,
featuring integral
sling attachment
points and battery
storage
compartment.
2.1.6. Gas Valve Position
The gas volume required for the function of the SIG 556 rifle can
be controlled by the gas valve. The gas valve has two 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.
SIG 556 Operators Manual 12 P/N 1511203 VER 12.7.3
b. Position 2 (Rib of gas valve in the slanted position).
When 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 utilize 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.
CAUTION: 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 weapon is unloaded and
clear of ammunition when manipulating the gas valve.
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 adjust the length of the butt stock, depress the adjusting
latch and move the stock to the desired position. Ensure the stock
is fully locked in position before firing!
SIG 556 Operators Manual 13 P/N 1511203 VER 12.7.3
3. To remove the butt stock, pull down on the adjusting latch and
remove the stock from the receiver extension.
3. The butt stock features a battery storage compartment, which is
accessed by peeling the butt pad off the stock at the 12 o’clock
position. The pad is attached to the stock by a rivet at 6 o’clock.
4. The butt stock features two (2) sling attachment points.
2.1.8. Trigger Guard Operation
1. The trigger guard opens to accommodate firing the rifle with
gloves or mittens.
2. To open the trigger guard, depress the spring loaded pin on the
front right and rotate downward.
SIG 556 Operators Manual 14 P/N 1511203 VER 12.7.3
3. When glove access is no longer required, rotate the trigger
guard back into place, depressing the spring loaded pin and
ensure the trigger guard is locked closed.
WARNING: Do not manipulate the trigger guard unless the
rifle’s safety lever is on “S” (SAFE) and confirmed unloaded!
2.1.9. Sights
The SIG 556 rifle features integrated accessory mounting rails on
the upper receiver and hand guards. These rails may be used for
attaching a variety of sighting systems, both optical and fixed.
The accessory rails are compatible with all Picatinny standard
mounting systems. Some models feature “emergency” flip up
blade sights as a standard option. These sights are designed to
provide a backup aiming solution in the event your optics should
fail but are certainly capable of be used as the sole sighting
system for the rifle.
SIG 556 Operators Manual 15 P/N 1511203 VER 12.7.3
WARNING - SIGHTS
Do not adjust or otherwise manipulate any
sight system on the rifle without first
confirming the magazine is removed, the
rifle is on “SAFE” and fully unloaded.
Failure to heed this warning could result in
unintentional discharge, resulting in injury
or death
UNLOAD RIFLE BEFORE
MANIPULATING SIGHTS.
Emergency sight deployment
The rifle’s emergency sights are normally stored in a “stowed”
condition to protect them from damage and prevent interference
with optical sighting systems.
To deploy the emergency sights for use, do the following:
1. Flip the front sight blade into the “up”
position. The front sight blade is retained
in position by spring tension.
2. Flip the rear sight blade into the “up”
position. The rear sight blade is held in
position by spring tension.
3. When the emergency sights are no longer required, rotate
the front and rear sight blades to their stowed position.
SIG 556 Operators Manual 16 P/N 1511203 VER 12.7.3
Windage (left / right) adjustment:
Windage adjustments are made by
rotating the front sight screw left or
right. The adjustment screw head is
located on the left side of the front
sight assembly. Adjustments are made
using a 4mm allen key, available at
any hardware store.
- Rotate front sight screw right
(clockwise) to move impact right.
- Rotate front sight screw left
(counter-clockwise) to move
impact left.
One full rotation of the front sight screw will move the impact of
the rounds approximately 1” at 100 yards.
Elevation (up / down) adjustment:
Elevation adjustments are made by
raising or lowering the sight plate, inset
on the back side of the rear sight blade.
- Loosen the phillips head screw
- Move the sight plate in the direction
required for adjustment.
- Tighten the phillips head screw.
SIG 556 Operators Manual 17 P/N 1511203 VER 12.7.3
- Slide rear sight blade up to
move impact up.
- Slide rear sight blade down to
move impact down.
One mark of movement on the rear sight blade will move the
impact of the rounds approximately 3/4” to 1” at 100 yards.
2.1.10. Magazine
The rifle ships standard with (1) 30-round magazine. The SIG 556
is compatible with M16/AR-15 type magazines.
2.2. Technical Specifications
Caliber 5.56mm NATO (.223 Remington)
Total length 37 inches
Length with stock collapsed 33.5 inches
Barrel length 16 inches
Number of grooves 6
Rifling 1 in 7
Weight (w/out mag) 7.8 lb
Specifications are approximate and subject to change without notice.
SIG 556 Operators Manual 18 P/N 1511203 VER 12.7.3
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