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.
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.
when it counts™ 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.” MAINE: “ENDANGERING THE WELFARE OF A CHILD IS A CRIME.
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.
when it counts™ 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) Pos
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 firearms 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® firearm 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 State by State Warnings 2 Locking Devices 6 General Safety Information and Mechanical Characteristics 13 Basic Rules of Safe Firearms Handling 13 1.0 Safety Information 14 1.1 Protect your Eyes and Ears 15 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 Bolt and Locking Mechanism 21 2.1.3 Safety Mechanism 22 2.1.4 Trigger Mechanism 23 2.1.5 Barrel 24 2.1.6 Receiver 25 2.1.
when it counts™ Topic Page 2.1.9 Magazine 26 2.1.10 Bipod 26 2.2 Technical Specifications 28 3.0. Handling 30 3.1 Important Instructions 30 3.2.1 Loading the Magazine 31 3.2.2 Loading Single Cartridge Only 32 3.3 Loading the Rifle 32 4.0 Cycle of Operation 33 4.1 Firing 33 4.2 Over Pressure Firing 33 5.0 Unloading 34 6.0 Procedures in case of a Stoppage 36 6.1 Failure to Fire (Cold Rifle) 36 6.2 Failure to Fire (Hot Rifle) 36 6.3 Recovery from Failure to Fire 37 www.
Topic Page 7.0 Field Strip Disassembly 37 8.0. Cleaning 38 8.1 Removing and Installing the Muzzle Brake 38 8.2 Cleaning Procedure 38 8.3 Cleaning the Magazine 40 8.4 Cleaning the Receiver and Trigger Assembly 41 8.5 Cleaning the Bolt Assembly 42 8.6 Bolt Maintenance 43 9.0. Full Reassembly 45 9.1 Field Strip Reassembly / Function Check 46 10.0 Lubrication 47 11.0 Transportation and Storage 48 12.0 Service and Replacement Parts Policy 49 13.0 Shipping Firearms for Repair 50 14.
when it counts™ WARNINGS OF GREAT IMPORTANCE ARE FOUND WITHIN THIS MANUAL Locking Devices 6 Correct Headstamp 32 Alterations 12 Storage 48 Ammunition 16, 19 Parts Purchase 52 Lead Exposure 19 Shipping 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. www.sigsauer.
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 FIREARM 12 www.sigsauer.
when it counts™ THE BASIC RULES OF SAFE FIREARMS HANDLING 1. ALWAYS treat every firearm 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 firearm. 5. ALWAYS wear ear protection and safety glasses when shooting. 6.
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. 1.2.
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.
when it counts™ 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.
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.
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.
1 2 A 1 2 3 4 5 6 20 Cheek Rest Safety Mechanism Bolt Assembly Ejector Port Receiver Chamber 8 3 9 10 7 8 9 10 11 12 4 5 11 6 A 12 Muzzle Brake Bolt Handle Trigger Trigger Guard Detachable Box Magazine Stock 13 13 14 15 A www.sigsauer.
when it counts™ 2.0. Mechanical Characteristics and Rifle Theory 2.1 Rifle Description 2.1.1 General The SIG50 rifle is a heavy barrel, rotary bolt action, push feed, large caliber precision rifle with detachable box magazine system with five shot capacity. The rifle is chambered in .50 BMG and is capable of shooting sub-MOA in the hands of qualified marksmen with applicable match ammunition. 2.1.2 Bolt and Locking Mechanism The bolt is constructed from 9310 steel.
2.1.3. Safety Mechanism The safety lever which is located on the right side of the receiver locks the trigger from being pressed to the rear when it is engaged. When pressed forward, the trigger is unlocked. The safety lever provides protection against accidental or unintentional discharge under normal usage when properly engaged. Safety Lever FIGURE 2: SAFETY Always move the safety lever to the rear (SAFE) position before handling, loading, or unloading the rifle.
when it counts™ 2.1.4 Trigger Mechanism The trigger mechanism is a mechanical type adjustable single stage trigger. The adjustment range is from 3.5 to 4.5 lbs. It is pre-set at 3.5 lbs from the factory. FIGURE 3: TRIGGER www.sigsauer.
2.1.5 Barrel The SIG50 barrel is a match grade, heavy fluted, free floating barrel. Barrel Inspection Procedure: • The inside of the barrel must be clean and free of obstructions. • Point the rifle in a safe direction. • Move the safety lever to the rear (SAFE) position. • Raise the bolt handle. • Pull the bolt all the way to the rear. • Remove any ammunition from the chamber and/or magazine. • Remove the bolt. • Look through the barrel from the chamber end to the muzzle.
when it counts™ 2.1.6 Receiver The receiver is CNC machined from bar stock. 2.1.7 Stock The buttstock is removable from the SIG50 rifle by unscrewing the knurled collar clockwise (left hand thread). To re-install the buttstock, insert the buttstock back into the stock until it indexes into place. You should not be able to rotate it prior to tightening the collar. Turn the knurled collar counter-clockwise to tighten the buttstock to the stock. Hand tight is sufficient. FIGURE 4: STOCK 2.1.8.
2.1.9 Magazine The SIG50 ships with one five (5) round high reliability metal magazine. It is compatible with most .50 caliber NATO ammunition. The receiver has a machined in feature that allows the operator to hand load a single round into the action with the box magazine in place. FIGURE 6: MAGAZINE 2.1.10 Bipod The SIG 50 has an adjustable four-position bipod which folds for transport.
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2.2 Technical Specifications CALIBER .50 BMG O.A.L. W/ BUTT STOCK ATTACHED 57.0” O.A.L. W/ BUTT STOCK REMOVED 46.125” BUTT STOCK LENGTH 11.625” WEIGHT 23.5 LBS FEEDING DEVICE/CAPACITY Detachable Magazine, 5 rounds BARREL BARREL LENGTH 29.0” BARREL WEIGHT 9.5 lbs NUMBER OF GROOVES 6 BARREL TYPE Fluted Match Grade RATE OF TWIST 1:15” DIRECTION OF TWIST Right Hand VELOCITY (750 GR AMAX) 2700 fps HEADSPACE (MAXIMUM) 3.1392 inch. 28 www.sigsauer.
when it counts™ All specifications are approximate. Specifications subject to change without notice. HEADSPACE (MINIMUM) 3.1332 inch. FIRING PIN PROTRUSION (MAXIMUM) 0.080 inch. FIRING PIN PROTRUSION (MINIMUM) 0.075 inch. MUZZLE THREAD PITCH 1x14 TPI TRIGGER TYPE Single Stage ADJUSTABLE Yes RANGE OF ADJUSTMENT 3.5 to 4.5 lbs FACTORY SETTING 3.5 lbs STOCK CONSTRUCTION Fiberglass CHEEK PIECE Adjustable BUTT STOCK (MINIMUM LENGTH) 12.5” BUTT STOCK (MAXIMUM LENGTH) 14.
3.0 Handling 3.1 Important Instructions • Before manipulating the weapon, ensure the safety lever is in the SAFE position. • Use only factory-new ammunition which corresponds to the caliber of the weapon. • During all manipulations of the rifle, point the weapon in a safe direction. • Do not place your finger on the trigger until the target has been verified and you intend to shoot. • Do not load the weapon until immediately before use. • Unload weapon immediately after shooting is finished.
when it counts™ 3.2.1 Loading the magazine. • • • • • • • Point the rifle in a safe direction. Move the safety lever to the rear (SAFE) position. Raise the bolt handle. Pull the bolt all the way to the rear. Insert the required number of cartridges into the magazine. Insert one cartridge into the chamber. Using your finger, depress the cartridges in the magazine, and slowly slide the bolt forward so the bolt rides over the top cartridge in the magazine.
3.2.2 Loading single cartridge only • • • • • • • Point the rifle in a safe direction. Move the safety lever to the rear (SAFE) position. Raise the bolt handle. Pull the bolt all the way to the rear. Insert one cartridge through the loading/ejection port and into the magazine. Push the bolt forward and chamber the cartridge. Lock the bolt closed. If you choose to insert the round directly into the chamber, the magazine follower must be depressed to allow the bolt to move forward.
when it counts™ 4.0 Cycle of Operation Ready to Fire Condition The SIG50 “Ready to Fire” condition is described as a loaded magazine properly seated into the magazine well, a live cartridge loaded into the chamber, the fire control selector place on “SAFE”. • To fire the rifle, move the safety lever to the forward (FIRE) position. THE RIFLE IS READY TO FIRE FIGURE 8: MAGAZINE BEING INSERTED 4.1. Firing Rotate the safety lever from the “SAFE” position to the “FIRE” position.
5.0. Unloading ALWAYS MAKE SURE THE MUZZLE IS POINTED IN A SAFE DIRECTION! 1. Point the rifle in a safe direction. 2. Move the safety lever to the rear (SAFE) position. 3. Depress the magazine release latch and remove the magazine from the rifle. 4. Raise the bolt handle. 5. Put one hand over the top of the ejection port. 6. Slowly pull the bolt to the rear with your other hand to remove the cartridge from the chamber. 7. Take hold of the cartridge and remove it from the rifle. 8.
when it counts™ WARNING: Removing cartridges from the magazine does not prevent the rifle from being fired! When there is a cartridge in the chamber and the safety lever is in the 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 SAFE position when the rifle is being unloaded.
6.0. Procedures In Case of a Stoppage A “Stoppage” is an interruption in the cycle of operation as depicted in Section 4.0. A stoppage can normally be repaired by the operator by performing one of the following immediate actions described. 6.1. Failure to Fire (Cold Rifle) Trigger is pressed, firing pin releases, rifle does not fire. 1. Ensure the magazine is properly seated in the magazine well by applying upward pressure and then pulling down on the magazine. 2.
when it counts™ 6.3 Recovery from Failure to Fire If the rifle does not fire after completing 6.1 or 6.2: 1. Unload, and clear the rifle; 2. Insert a fresh magazine; 3. Slide bolt forward to chamber a round; and 4. Attempt to fire the rifle. IF THE RIFLE FAILS TO FIRE AFTER ATTEMPTING ALL OF THE ABOVE, THE RIFLE SHOULD BE RETURNED TO SIG SAUER, INC. FOR EVALUATION BY A FACTORY TRAINED TECHNICIAN. 7.0. Field Strip Disassembly 1. Unload and clear the rifle per section 5.0. 2.
8.0. Cleaning Clean the rifle after 30 to 40 rounds in order to maintain “benchrest accuracy.” 8.1 Removing and Installing the Muzzle Brake 1. The rifle can be cleaned with the muzzle brake on or off. 2. To remove the muzzle brake, use a 12-inch or 300mm adjustable wrench with two layers of masking tape on the jaws. Clamp barrel in padded vise just behind the brake. You may have to use a wood mallet and/or nylon hammer, and give a sharp rap on the end of the wrench to break it loose.
when it counts™ 6. Install the bore guide in the receiver. Replace the brass jag with the phosphor bronze brush, wet it with solvent and run it through the barrel and out the muzzle. Once the brush is forward of the muzzle, pull the brush back through the bore and out of the chamber. Do this a total of ten (10) times. After the tenth time, reapply the bore solvent and run the brush back through another ten (10) times.(Up and back is one time.) NOTE: NEVER reverse the brush while inside the bore. 7.
NOTE: For barrels using moly coated bullets, additional cleaning may need to be done to remove the moly fouling. 11. To remove moly fouling, wrap the brass jag with a dry patch. Install bore guide into receiver. Apply a bore paste to the patch and work the patch down the bore in the same manner as the copper remover. Repeat as necessary but do not over do. Once all moly fouling is removed, dry patch bore until patches come out clean.
when it counts™ 8.4 Cleaning the Receiver and Trigger Assembly 1. Move the safety lever to the rear (SAFE) position. Action Screws 2. Remove the bolt assembly. 3. Turn the rifle upside down. 4. Remove the two action screws. 5. Carefully lift the stock away from the receiver and trigger assembly. NOTE: Clean the receiver and trigger assembly as a unit with a degreaser. Do not leave any degreaser on coated surfaces any longer than necessary. 6. Wipe the receiver down with a light coat of oil.
8.5 Cleaning the Bolt Assembly 1. Remove the bolt assembly from the rifle. 2. Use a good quality solvent and a rag to wipe down the bolt body. Ensure that all fouling and residue are removed. 3. With a good quality bristle brush and solvent scrub the bolt face and remove all fouling and loose brass from the bolt face. 4. Lift the extractor upward and clean under the extractor notch with the brush and solvent. 5. Dry thoroughly and lubricate bolt body with a small amount of gun oil. 6.
when it counts™ 8.6 Bolt Maintenanence 1. Remove the bolt from the receiver. 2. Hold the bolt in your left hand with the bolt handle towards you, bolt face to the left, cocking piece housing to the right, and with the cocking piece facing up. 3. Holding the bolt firmly in your left hand, grasp the cocking piece housing with your right hand, and give the cocking piece housing a 1/8 turn away from you (clockwise). This unlocks the firing pin assembly from the bolt. 4.
6. To reinstall the firing pin assembly, first apply grease at both locking tabs located on the cocking piece housing. Grasp the bolt with your left hand with the back of the bolt facing to the right. Install the firing pin assembly into the back of the bolt while aligning housing tabs with the notches in the bolt body. When aligning the tabs, the cocking piece should be positioned to the right of the cocking cam and notch (LH models will be to the left).
when it counts™ 9.0 Full Reassembly Your SIG SAUER SIG50 Precision Rifle can be broken down into two major components: the stock assembly and the action/barrel assembly. 1. Inspect the stock and make sure there is no grit, dust, or any foreign matter in the recoil lug recess or bedding (action) area. THIS IS ABSOLUTELY CRITICAL TO ACHIEVE ACCURACY. 3. Carefully inspect the action/barrel assembly and check that it is clean and free of any foreign matter. 4.
9.1 Field Strip Reassembly / Function Check 1. Point the rifle in a safe direction. 2. Move the safety lever to the rear (SAFE) position. 3. Align the lugs on the bolt at 12 and 6 o’clock. NOTE: The magazine follower must be depressed to allow the bolt to enter the receiver. 4. Slide the bolt assembly into the receiver approximately halfway and rotate it until the bolt stop/guide clicks into its track. 5. To lock the bolt assembly into position, push the bolt handle down. 6.
when it counts™ 10.0 Lubrication 1. Wipe the rifle down with a clean soft cloth. A thin coat of light oil may be applied to all steel surfaces. Apply gun grease (non-melting grease, not heavy oil) at the rear of the locking lugs located at the front of the bolt, and the cocking cam located at the rear-underside. Keep grease from getting into the trigger as this may create an unsafe condition. Do not over lube. 2. When the rifle is to be stored, it should be carefully cleaned and thoroughly oiled.
11.0 Transportation and Storage When transporting your firearm to and from shooting activities, keep it unloaded for your safety and for the safety of others. When storing your firearm, keep it separated from ammunition, under lock and key if possible, and out of the reach of children and other inexperienced or unauthorized persons. WARNING - STORAGE: Never place or store any firearm in such a manner that it may be dislodged.
when it counts™ 12.0. Service and Replacement Parts Policy Parts Policy Our Service Department maintains a full complement of replacement parts. Even though most gunsmiths have the knowledge, training, and the ability to make necessary repairs to your firearm, the skill and workmanship of any particular gunsmith is totally beyond our control. Should your firearm ever require service, we strongly recommend that you return it to SIG SAUER Inc.
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. 13.
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 SIG50, 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 14.0 and 14.1. Please refer to the Service & Parts Policy on pages 49 and 50.
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14.
when it counts™ 14.1 SIG50 Parts Diagram www.sigsauer.
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 Defective magazine Replace 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 Insufficient extractor tension due to fouling Clean bolt and ext
when it counts™ Malfunction Cause Correction Firing pin obstructed Inspect, clean and lubricate the rifle Faulty ammunition Manually cycle in next round Firing pin damaged or broken Return to SIG SAUER Ignition Hammer drops but round does not fire www.sigsauer.
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.
when it counts™ Notes: www.sigsauer.
when it counts™ www.sigsauer.
