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. 12SIG541_SIG551_A1MiniManual_Rev1.
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.
when it counts™ 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.
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.
when it counts™ 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.
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.
when it counts™ 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.
TABLE OF CONTENTS Topic Page Locking Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 General Safety Information and Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . .14 1.0 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 1.1. Protect Your Eyes And Ears . . . .
when it counts™ Topic Page Operation of Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 Operation of Safety in Select Fire Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 The Bolt Catch Lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Ammunition. . . . . . .
Topic Page 4.1.4 Bolt Advance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 4.2 Trigger Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 4.2.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51 4.2.2 Trigger Safe Position “S”. . . . . . .
when it counts™ Topic Care and Cleaning Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 Transportation & Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79 8.0 Sight Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 Troubleshooting. .
WARNINGS OF GREAT IMPORTANCE ARE FOUND WITHIN THIS MANUAL Locking Devices Alterations Sights Manual Safety Ammunition Lead Exposure Handling 6 13 27 30, 34 36, 39 39 40, 58 Loading Firing Unloading Storage Parts Purchasers Shipping 41 44, 58 60 80 87 89 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. 12 12SIG541_SIG551_A1MiniManual_Rev1.indd 12 www.sigsauer.
when it counts™ 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 www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
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.
when it counts™ 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.
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 hand guards. The receiver guides the bolt and bolt carrier, and houses the locking system.
when it counts™ 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 www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
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. Polymer HanDguarD Pre-DrilleD For oPtional m1913 rail Kit aluminum QuaD rail 18 12SIG541_SIG551_A1MiniManual_Rev1.indd 18 www.sigsauer.
when it counts™ 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 four 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 “3”: The weapon fires 3-round burst.
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.
when it counts™ 2.1.6 Butt Stock Operation StoCK latCH www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
2.1.7 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. 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.
when it counts™ 2.1.8 Gas Valve Position The gas volume required for the function of the SIG551-A1 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. b. Position 2 (Rib of gas valve in the slanted position). PoS 1 - riB VertiCal PoS 2 - riB SlanteD www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
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 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.
when it counts™ 2.1.9 Sights The SIG551-A1 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.
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. - 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.
when it counts™ 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. www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
Emergency sight deployment The rifle’s emergency sight are normally stored in a “stowed” condition to protect them from damage and prevent interference with optical sighting systems. To deploy the emergency sight for use, do the following: 1. Flip the rear sight blade into the “up” position. The rear sight blade is held in position by spring tension. 3. When the emergency sight is no longer required, rotate the rear sight blades to the stowed position. 28 12SIG541_SIG551_A1MiniManual_Rev1.indd 28 www.
when it counts™ 2.1.10 Magazine The rifle ships with our Swiss transparent magazine. If more than one magazine is purchased, they can be attached together by integral clips built into the magazine body. OPERATION OF SAFETY The SIG551-A1 has a manual safety which is located on the left and right side of the trigger casing, just forward of the pistol grip and above the trigger. The safety levers may be operated from either side. SaFety leVer (leFt & rigHt SiDe oF PiStol) leFt SiDe VieW www.sigsauer.
The safety is “ON” when the safety lever is in the “S” (SAFE) position and the trigger guard is closed. In this position, the rifle cannot be fired with a normal pull of the trigger. The safety lever should always be in the “S” (SAFE) position except when the shooter is actually firing the rifle. The safety lever should be moved to the “S” (SAFE) position whenever the shooter ceases firing, even temporarily. MANUAL SAFETY ON The safety is “OFF” when the safety lever is in the “F” (FIRE) position.
when it counts™ OPERATION OF SAFETY FOR SELECT FIRE VERSIONS The SIG551-A1 Select Fire has a manual safety which is located on the left and right side of the trigger casing, just forward of the pistol grip and above the trigger. The safety levers may be operated from either side. The safety is “on” when the safety lever is in the “S” (SAFE) position and the trigger guard is closed. In this position, the rifle cannot be fired with a normal pull of the trigger.
The safety lever should always be in the “S” (SAFE) position except when the shooter is actually firing the rifle. The safety lever should be moved to the “S” (SAFE) position whenever the shooter ceases firing, even temporarily. The safety is “off”when the safety lever is in the “F” (FIRE), “3” (3 SEMI-AUTOMATIC BURST) or “A” (AUTOMATIC) positions. When the safety lever is in the “F” position the rifle will fire in the semiautomatic mode each time the trigger is pulled until all the ammunition is expended.
when it counts™ Right Side View semi-auto 3 ROUND BURST www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
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.
when it counts™ Bolt Catch Lever The SIG551-A1 rifle is equipped with a bolt catch lever. The purpose of the bolt catch lever is two-fold. The bolt catch may be manually engaged with the bolt pulled to the rear (open position). This action locks the bolt open, allowing an unobstructed view of the chamber area.
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.
when it counts™ 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.
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.
when it counts™ 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.
TO LOAD AND FIRE (WITH MAGAZINE) 3.0 Handling 3.1 Important Instructions • Before manipulating the weapon, ensure the safety 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.
when it counts™ 3.2 Loading The Rifle 1. 2. 3. 4. Ensure the safety lever is in the “S” (SAFE) position; Insert the magazine and check that it is properly seated; Bolt forward: Pull the charging handle back fully and release; or 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). www.sigsauer.
3.3 Loading The Magazine 1. 2. 3. 4. Ensure the magazine is the proper type and caliber for the rifle; Hold the magazine vertically; Place a round between the feed lips and press down - ensure the bullet is facing the front of the magazine; and Place the next round on top of the previous round and repeat until the desired number of rounds are loaded. 3.4 Changing The Magazine 1. Ensure the safety lever is in the “S” (SAFE) position; 2.
when it counts™ 3.5 Reloading (Rifle Empty, Bolt Locked Open) 1. 2. 3. 4. Ensure the safety lever is in the “S” (SAFE) position; Remove the magazine by pressing the magazine catch; Insert a loaded magazine and check that it is properly seated; Release the bolt catch fully by: a. Depress the bolt catch upward; or b. Pull the charging handle back slightly and release.
4.0 Function 4.1 General Weapon Function of SIG551-A1 4.1.1 Ready to Fire When the rifle is in a “ready to fire” condition the bolt is closed and locked. • the recoil spring (2) holds the bolt carrier (4) in the front final position, via the gas piston (1). • the bolt head (5) is rotated by the control cam (3) of the bolt carrier (4) in such a way that its locking lugs (8) engage in the corresponding recesses of the locking piece (9).
when it counts™ WEAPON LOADED - READY TO FIRE www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
4.1.2 Discharging the shot By pressing the trigger (11) the hammer (7) is released. The hammer is under pressure of the hammer spring (12) and strikes the firing pin (10) which, in turn, impacts against the cartridge primer of the cartridge (P) thus discharging the shot. ILLUS. 57) DISCHARGING THE SHOT 46 12SIG541_SIG551_A1MiniManual_Rev1.indd 46 www.sigsauer.
when it counts™ 4.1.3 Unlocking and Recoil of Bolt The gas pressure, generated by the burning powder, drives the bullet through the barrel (13). As soon as the projectile passes the gas port (15), propellant gas flows through the adjustable gas valve (14). The gas pressure acts on the gas piston (1) which pushes the bolt carrier (4) to the rear. During the rearward motion of the bolt carrier (4) the bolt head (5) is rotated by the control cam (3) so that the locking lugs (8) are disengaged.
ILLUS. 59) UNLOCKING BEGINS The bolt assembly moves back along the rails in the receiver (16) as far as the stop (17) whereby: • the recoil spring (2) is compressed; • the hammer (7) is cocked; • the extractor (18) extracts the case from the chamber; • the ejector (19) ejects the case through the port in the receiver (16). 48 12SIG541_SIG551_A1MiniManual_Rev1.indd 48 www.sigsauer.
when it counts™ ILLUS. 60) case ejection www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
4.1.4 Bolt advance The force of the compressed recoil spring (2) thrusts the bolt forward. The bolt head (5) feeds the next round from the magazine (20) into the chamber. In the final stage of the advance, the bolt head (5) locks up and the release bar (6) is depressed. The weapon is ready to be fired. ILLUS. 64) bolt advance 50 12SIG541_SIG551_A1MiniManual_Rev1.indd 50 ILLUS. 64a) bolt LOCK www.sigsauer.
when it counts™ 4.2 Trigger functions 4.2.1 General Home position for describing the trigger functions: • the hammer (3) is held by the sear (4) • the release bar (2) is depressed by the bolt carrier (1) • auto sear (5) is not engaged. 4.2.2. Trigger in safe position “S” The safety lever (6) is set to “S”. The safety shaft (7) locks the trigger (8). illus. 64) TRIGGER IN SAFE POSITION “S” 4.2.3. Semiautomatic fire The safety lever (6) is set to “F” and the hammer (3) is held by the sear (4). ILLUS.
By pulling the trigger (8) and after having overcome the pressure point, the sear (4) releases the hammer (3) which strikes the firing pin (9). The sear (4) falls downwards. ILLUS. 66) STRIKING THE FIRING PIN The recoiling bolt presses the hammer (3) down and releases the auto sear (5) via the release bar (2). The auto sear (5) catches the hammer (3). During the bolt advance, the bolt presses down the release bar (2).
when it counts™ 4.2.4 3-round burst control system The safety lever (6) is set to “3”. The automatic fire pawl (11) lies in the groove of the safety shaft (7). The segment (10) is controlled by the safety shaft (7) and moved upward. ILLUS. 68) Home position, 3-round burst control system By pulling the trigger (8), the sear (4) is withdrawn and simultaneously retained by the automatic fire pawl (11).
When the hammer (3) is thrust forward, the chargeover (14) presses the pawl (13) via its eccentric (15) on the segment (10). The segment (10) jumps up by one notch. The recoiling bolt cocks the hammer (3) which is retained by the auto sear (5) (refer to illus. 67). ILLUS. 70) Trigger mechanism after firing (first round) The advancing bolt presses the auto sear (5) via the release bar (2) to the rear thus releasing the hammer (3). The segment (10) moves up another notch. ILLUS.
when it counts™ When the third round is fired – just like the second round – via the release bar, the segment (10), pressed by the chargeover (14) jumps on the driving cam (12) of the trigger (8) and interrupts the support of the sear (4) by the automatic fire pawl (11). illus. 72) Trigger mechanism after the third round The auto sear (5) catches the hammer (3) (refer to illus. 67). The advancing bolt drives the release bar (2) downward.
4.2.5 Full auto fire The safety lever (6) is set on “A”. The automatic fire pawl (11) which supports the sear (4) lies in the groove of the safety shaft (7). By pulling the trigger (8) the sear (4) is drawn to the rear and supported by the automatic fire pawl (11). The hammer (3) is released and strikes forward (refer to illu. 66). The recoiling bolt cocks the hammer (3) which is retained by the auto sear (5) (refer to illu. 67). illuS.
when it counts™ Keep the muzzle pointed in a safe direction and your finger away from the trigger when cocking any firearm. Never carry or leave unattended any firearm which is cocked and ready to fire! When cocked, it could fire from slight pressure on the trigger. An accidental discharge could easily result if you fall or drop the firearm, or if the firearm is struck or disturbed by someone or something.
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 WARNING - HANDLING If dropped or struck with the safety “off,” the rifle may fire.
when it counts™ TO UNLOAD MAGAZINE AND RIFLE 5.0 Unloading 1. Ensure the safety lever is in the “S” (SAFE) position. 2. Ensure bolt is locked open (chamber visible); 3. Remove magazine by depressing the magazine catch; and 4. Verify the chamber is empty, both visually and physically. Always make sure the muzzle is pointed in a safe direction! Remember to clear the chamber after the magazine has been removed.
WARNING - UNLOADING 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.
when it counts™ TO EXTRACT AND EJECT A CHAMBERED CARTRIDGE When the rifle is fired, the same gas pressure which drives the bullet forward also acts through the cartridge case to push the bolt to the rear. That action causes extraction and ejection of the fired case. But, when the bolt is operated by hand, there can be a failure to extract the cartridge from the chamber, or a failure to eject the cartridge clear of the rifle.
TO CLEAR A MALFUNCTION (“JAM”) 6.0 Procedures In Case Of Malfunction Should the rifle fail to fire, perform the following actions: • Cycle the bolt; and • Continue firing. If • • • the rifle does not fire after cycling the bolt: Insert a fresh magazine; Cycle the bolt; and Continue firing.
when it counts™ If • • • • • the rifle still will not fire: Put safety lever in the “S” (SAFE) position; Unload per section 5.0; Clean weapon per section 9.1; Load; and Place safety lever on position “F” (FIRE), and continue firing. If the rifle malfunction cannot be corrected, the rifle should be returned to SIG SAUER Inc. for evaluation by a factory trained technician.
WARNING: A cartridge fires when the firing pin impacts the primer, and also can be “discharged” before it is chambered if its primer receives a sharp blow. If a cartridge hangs up, jams, or binds when being chambered or when fed from the magazine into the chamber, do not attempt force it into the chamber by pushing or striking the charging handle. Any jam or feeding problem is a signal to immediately stop using the rifle until the issue can be determined.
when it counts™ TO DISASSEMBLE 7.0 Field Strip Disassembly taKeDoWn Pin 1. Unload rifle (see section 5.0) – visually and physically check to ensure the rifle is clear of all ammunition; 2. Ensure the bolt is forward; 3. Retract the takedown pin (rear pin) – this pin is captured and does not fully remove; SteP 3 4. Remove the pivot pin (forward pin): unscrew the pivot pin screw (left side) and remove the pivot pin from the trigger casing; PiVot Pin 5.
6. Depress the charging handle catch and remove the charging handle; SteP 6 7. Using the charging handle, push the bolt carrier assembly to the rear and remove it from the receiver; SteP 7 66 12SIG541_SIG551_A1MiniManual_Rev1.indd 66 www.sigsauer.
when it counts™ 8. Rotate the bolt head counterclockwise until the lug clears the cam and pull to remove it from the bolt carrier; SteP 8 9. Pull lower hand guard or lower quad rail to the rear and down and remove; 10. Lift upper hand guard at the rear and pull away from gas block; StePS 9 & 10 www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
11. Depress the stop pin and hold. Rotate the gas valve to the left and pull forward to remove; step 11 12. Push the operating rod assembly forward and remove from the gas tube; step 12 68 12SIG541_SIG551_A1MiniManual_Rev1.indd 68 www.sigsauer.
when it counts™ 13. Depress the stop pin and rotate the gas tube to the left ninety degrees (90°) until the gas tube notch faces the barrel; step 13 14. Remove the gas tube from the gas block; step 14 www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
15. Remove the firing pin: a. Depress the firing pin by pressing the rear of the bolt head against a flat surface until flush and hold; b. Remove the firing pin stud using an aid (small punch, nail, or pencil) and SLOWLY raise the bolt head until tension is released on the firing pin spring; and c. Remove firing pin and firing pin spring from the bolt head. step 15B step 15C CAUTION: The firing pin is under spring tension when installed in the bolt head.
when it counts™ www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
7.1 Reassembly The rifle should always be reassembled in the reverse order of disassembly: 1. Install the firing pin: a. Insert the firing pin and firing spring into the bolt head. The spring should be at the rear. Ensure that the notch on the firing pin is aligned with the firing pin stud. b. With one hand, place the bolt head (firing pin at the bottom) on a flat surface and depress the firing pin until the notch in the firing pin is aligned with the hole in the bolt shaft for the firing pin stud. c.
when it counts™ 4. Install the gas valve: a. Ensure the stop pin recesses on the back of the gas valve tab face the barrel. b. Insert the gas valve into the gas tube (the gas valve will seat over the operating rod). c. Depress the stop pin and rotate the gas valve to the right to Position 1. d. Release the stop pin. Check to ensure the gas valve indexes in Positions 1 and 2. 5. Install the upper hand guard: a. Insert the front into the gas block. b. Push the rear downward until seated. 6.
8. Install the bolt assembly into the receiver: a. Hold the receiver muzzle down. b. Holding the bolt carrier, align the left lug on the bolt head with the lug channel in the receiver. c. Ease the bolt assembly forward until the left and right receiver rails are riding in the rail channels on the bolt carrier. d. Release the bolt carrier — it should drop freely into the receiver until the bolt is fully locked. e.
when it counts™ 7.2 Function Check Each time the weapon is stripped, verify its functions as follows: Sequence of Procedure 1. Unload in accordance with section 5.0. 2. Remove magazine. 3. Ensure that charging handle is forward and bolt is closed. 4. Functions: a. With safety lever on “S” execute loading cycle, pull the trigger. • Hammer must not drop, the trigger must be blocked. b. With safety lever on “F”, pull the trigger and hold it back. • Hammer must drop.
For Select-Fire rifles only: c. Cycle the action (for Select-Fire rifles) d. Safety lever on “3”, pull the trigger and hold it back. • Hammer must drop. With hammer held back, cycle the action (allow bolt to slide forward slowly). • Hammer must drop immediately as the bolt locks up. Repeat the loading cycle. • On the third loading cycle, the hammer must not drop. Release the trigger. e. With safety lever on “A”, repeat procedure as under “3”. • Hammer must drop each time.
when it counts™ 6. Insert empty magazine, check that it is firmly seated. 7. Bolt catch a. Cycle action (charging handle to rear). • Bolt must be caught in its rear position. b. Release bolt catch. • Bolt must release and fully close. c. Pull the trigger, apply the safety lever. www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
MAGAZINE INSPECTION AND CARE Inspect the magazine frequently. The magazine follower must move freely and have adequate spring tension so that each cartridge is quickly raised to the feeding position. The magazine lips should be clean and free of cracks, dents, or nicks, so that cartridges are held in their proper feeding position. When cleaning is necessary, use a solvent that will not rust the metal components or adversely affect the magazine follower.
when it counts™ CARE AND 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! 4.
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.
when it counts™ SIGHTS 8.0 Sight Options 1. The SIG551-A1 rifle is equipped with accessory mounting rails that allow a wide variation of sighting systems to be utilized. The gas block provides a dovetail mount that allows installation of a fixed front sight (optional on certain models). This optional front sight can be combined with a fixed type rear sight designed for mounting on the receiver accessory rail. 2. Always follow the manufacturer’s instructions when mounting a sighting system. 3.
Troubleshooting Guide Malfunction Cause Correction No round fed into the chamber Magazine not properly inserted or magazine is deformed or dirty Insert magazine properly or change magazine Bolt does not close easily or completely Rifle or cartridge is fouled (dirty) or rifle is too heavily lubricated Clean and lubricate rifle and/or replace the ammunition Incorrect ammunition Replace ammunition Rifle requires service Return to SIG SAUER Insufficient recoil due to dirt Clean and lubricate the r
when it counts™ Malfunction Cause Correction Firing pin obstructed Inspect, clean and lubricate the rifle Faulty ammunition Manually cycle in next round Rifle requires service Return to SIG SAUER Ignition Hammer drops but round does not fire www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
MAINTENANCE 9.0 Maintenance All firearms require periodic maintenance and inspection which may reveal a need for adjustment or repair. Have your firearm checked by a competent gunsmith annually even if it seems to be working well, since breakage, improper functioning or corrosion of some components may not be apparent from external examination. If you notice any mechanical malfunction, DO NOT continue to use the firearm.
when it counts™ 9.1 Cleaning The SIG551-A1 rifle must be cleaned after each shooting session or whenever performance is suspect. Clean the rifle as follows: 1. Unload the weapon per Section 5.0; 2. Field strip the weapon per Section 7.0; 3. Clean the barrel and chamber from the rear; 4. Clean other parts of the rifle, using care to remove carbon and firing residue. Pay particular attention to the operating rod, gas valve, and chamber areas; 5.
SERVICE AND 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. (see page 53).
when it counts™ 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.
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.
when it counts™ 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.
ORDERING PARTS In the event you want to order parts for your SIG551-A1 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. A parts list and diagram of the rifle is provided in sections 10.0 and 10.1. Please refer to the Service & Parts Policy on pages 86-89. 90 12SIG541_SIG551_A1MiniManual_Rev1.indd 90 www.sigsauer.
when it counts™ 10.0 Technical Specifications Specification Caliber SIG551-A1 Classic SIG551-A1 SF 5.56mm NATO (.223 Remington) SIG551-A1 SHORT SF SIG551-A1 SHORT SF SWAT 5.56 x 45mm NATO Action Type Select Fire (Single, 3rd Burst, Auto) Rate of Fire 625-775 RMP 650-800 RPM Overall Length 37.0” 37.2” 30.5” 31.4” 27.2” 20.1” 21.6” 16” 16.3” 10” 10” 7.8 lbs 8.5 lbs 6.9 lbs 7.
10.1 SIG551-A1 Parts List Upper Receiver Group 111 Receiver assembly 112 Accessory rail 113 Accessory rail fastener 114 Bolt cover 115 Bolt cover Rivet 211 Barrel 212 Flash suppressor 213 Crush washer 214 Gas block 215 Roll pin 4x28mm 216 Stop pin 217 Compression spring 218 Roll pin 2x6mm 219 Gas valve 220 Gas tube 221 Operating rod 222 Recoil spring 223 Spring pin 2.
when it counts™ www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
10.2 SIG551-A1 Select Fire Parts List Upper Receiver Group 111 Receiver assembly 112 Accessory rail 113 Accessory rail fastener 114 Bolt cover 115 Bolt cover Rivet 211 Barrel 212 Flash suppressor 213 Crush washer 214 Gas block 215 Roll pin 4x28mm 216 Stop pin 217 Compression spring 218 Roll pin 2x6mm 219 Gas valve 220 Gas tube 221 Operating rod 222 Recoil spring 223 Spring pin 2.
when it counts™ 312 www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
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.
when it counts™ 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.
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when it counts™ Notes: www.sigsauer.com 12SIG541_SIG551_A1MiniManual_Rev1.
when it counts™ www.sigsauer.com For Product Service on this model, Please Call (603) 772-2302 18 Industrial Drive, Exeter, NH 03833 USA P/N 1512024 Rev 1 12SIG541_SIG551_A1MiniManual_Rev1.
