M107A1 Operator’s Manual PO Box 1077 Murfreesboro, TN 37133 / 615.896.2938 / 615.896.7313 / mail@barrett.
USE OF THIS MANUAL Before you handle the M107A1 rifle, read this manual in its entirety. It is important that you understand the principles of safe gun handling in general and the unique features of this rifle. This manual is not a substitute for training from a qualified instructor. Important safety topics are discussed in this chapter and throughout this manual. This manual should remain with the rifle and it should be transferred with the rifle to subsequent owners.
Eye protection Eye protection should be worn when both shooting and maintaining your rifle. It is normal for firing to generate airborne dust and debris. Glasses also protect you from scopes during recoil. Protect your eyes from solvents and uncaptured parts under spring pressure while performing maintenance on your rifle. Assume every gun is loaded Treat every gun as if it were loaded. Do not trust your memory and do not take anyone else’s word for it.
Identify your target and backstop Before you pull the trigger, make certain of your target and what is beyond it. The rifle should never be fired at surfaces where bullets are likely to glance off in unpredictable directions. Failure to fire If your rifle fails to fire when you pull the trigger, do not attempt to clear the action. Keep the rifle pointed toward a safe area and wait two minutes. If a hang fire (slow ignition) has occurred, the round will probably fire within two minutes.
WARRANTY AND SERVICE Barrett Firearms Manufacturing, Inc. (BFMI), warrants that this firearm was manufactured free of defects in materials and workmanship. For one year from the date of purchase by the original owner, BFMI agrees to correct any defect in this firearm for the original purchaser by repair or replacement with the same or comparable model.
TABLE OF CONTENTS Use of the Manual 1 Safety Guidelines 1-3 Warranty and Service 4 Table of Contents 5 Specifications & Capabilities 6 Contents 7 General Function, Storage, Repair 8 Break-in 8 Equipment Description & Data 9-10 Inspection of Major Components 11 Upper Receiver 12 Bolt Carrier Group 13 Lower Receiver 14 Assembly of Major Components 15-19 Operating the Rifle 20-23 Suppressor 24-25 Preventative Maintenance Procedures 26 Cleaning and Lubrication 27 Exploded Vie
SPECIFICATIONS Model: M107A1 M107A1 CQ Caliber: Operation: .50 BMG (12.7 x 99 mm) Semi-Automatic .50 BMG (12.7 x 99 mm) Semi-Automatic Weight: 28.55 lbs (12.95 kg) 27.25 lbs (12.36 kg) Overall Length: (Assembled) Length: (Takedown Mode) 56.8" (144.28 cm) 48.4" (122.94 cm) 37.75" Lower 41.375" Upper 37.75" Lower 41.375” Upper Barrel Length: 29" (73.66 cm) 20.6" (52.
CONTENTS Your M107A1 rifle includes the following: Rifle Watertight and airtight carrying case Operator’s manual 1 Magazine Your rifle may have included a monopod, bipod, suppressor, rifle scope, BORS, rings or other optional accessories. It may have also included cleaning fluids and a cleaning kit. The rifle is shipped from the factory in 2 pieces; the upper receiver assembly and lower receiver assembly.
TYPE OF MANUAL: Operator’s instruction manual for the Barrett M107A1 rifle. GENERAL FUNCTION As the cartridge is fired, the energy from the projectile drives the barrel rearward. The rearward moving barrel drives the bolt carrier rearward. As the bolt carrier moves to the rear, the bolt unlocks and the cartridge is extracted and ejected from the rifle. Near the end of the bolt carrier’s rearward motion, the bolt us fully extended, the rifle is cocked and the main spring buffer is compressed.
EQUIPMENT DESCRIPTION AND DATA Equipment Specifications and Capabilities. The technical specifications and capabilities of the M107A1 (Figure 1-1). Figure 1-1. Rifle, M107A1 IDENTIFICATION AND DESCRIPTION OF MAJOR COMPONENTS 1. Upper Receiver. Aluminum extrusion cover combining and including the front and rear sights, integrated scope rail, cheek piece, muzzle brake and barrel. 2. Rear Sight Leaf. Peep style aperture with elevation markings for 100 to 1500 meters. Rear sight scale for .50 BMG. 3.
4. Muzzle Brake. Critical for recoil absorption. Cylindrical design for Sound Suppressor integration. 5. Barrel. Muzzle end is threaded to accept cylindrical muzzle brake; breech end has a barrel extension integral to the locking function. 6. Bolt. Lightweight and Nickel Teflon coated. Houses the extractor and ejector. 7. Bolt Carrier. Consists of the bolt (8), firing mechanisms, cocking lever, and sear. 8. Bipod Assembly.
INSPECTION OF MAJOR COMPONENTS WARNING Unload and clear the rifle before disassembly. Ensure no live ammunition is present during disassembly or assembly. Inspection of Rifle’s Major Components The rifle’s four major groups are packaged as shown in below. 1. Upper Receiver 2. Bolt Carrier Group 3. Lower Receiver Ensure all components are present and inspect for obvious damage, reporting any discrepancies to the Barrett factory.
INSPECTION - THE UPPER RECEIVER 1. Barrel springs must not be overstretched, and each coil should be tight, with no spaces between coils. 2. Battery bumpers should be in good condition (not frayed, cracked, or twisted). 3. The muzzle brake should be tight and fully screwed on. 4. The upper receiver should not be cracked, bent, or burred. 5. Check the hinge lip at the front of the upper receiver to ensure that it is not cracked, bent, or deformed in any way. 6.
INSPECTION - THE BOLT CARRIER GROUP 1. Ejector (1) and extractor (2) must be checked to ensure they are under spring tension, and neither chipped nor worn. Extractor and Ejector should not stick in one position. 2. With firing mechanism de-cocked (use rear lock pin to depress sear (3)), manually work the bolt (4) in and out, feeling for any roughness, which may indicate wear, corrosion, or dirt/grit in the bolt carrier (5). 3.
INSPECTION - THE LOWER RECEIVER 1. With bolt carrier in place, pull it rearward and check to see that the mainspring moves freely (full travel) and is not deformed. 2. Hold bolt carrier back while clearing the mainspring housing (sheet metal closure). With the thumb safety on fire, pull the trigger. Firing mechanism should function (a slight rise in bolt carrier is normal). If the housing is bent, the bolt carrier will rise excessively as the trigger is pulled, preventing proper functioning. 3.
ASSEMBLY OF MAJOR COMPONENTS 1. Grasp the Lower Receiver Group and extend the bipod legs by pulling the legs down to the front, where they will lock into place. To retract, pull down on leg and swing back into position along the receiver. If firing without using the bipod, fold them forward to preclude interference with the charging handle. Pulling on the feet of the bipod causes the legs to extend. To retract a leg, depress the plunger located on the bipod leg and push up on the foot.
3. Standing above and to the rear of the lower receiver, grasp the charging handle with the right hand, and carefully pull back, against tension, while withdrawing the midlock pin from its retaining hole. Allow the bolt carrier to come forward SLOWLY until there is no more spring tension and it rests in the lower receiver. 4. Carefully pick up the upper receiver. The barrel will be nested inside for compact storage. Align the barrel so that its feed-ramp (slanted entry to firing chamber) is to the bottom.
WARNING THE TENSION ON THE BARREL SPRINGS IS ABOUT 70 lbs (32 kg). SERIOUS INJURY COULD RESULT IF SPRINGS ARE SUDDENLY RELEASED. 5. The barrel springs at the front of the upper receiver are held together by the barrel key. Maintaining the downward tilt of the upper receiver (to keep the barrel in place) firmly grasp the barrel key—not the springs—and pull it into place on the forward slot of the barrel. Work the barrel key until it is firmly seated in the barrel slot.
7. Engage the notch in the front barrel bushing of the upper receiver with the front hinge pin of the lower receiver. While positioned directly behind the rifle, grasp the charging handle and pull rearward against mainspring tension so the bolt will clear the barrel extension when the upper receiver is lowered. 8. Lower and close the upper receiver onto the lower receiver. Release the charging handle SLOWLY until the bolt is fully closed.
9. Place the midlock pin (shorter pin) through the hole near center bottom of the rifle, until it snaps fully to lock the upper and lower receivers together. Insert the rear lock pin through the rear hole of the upper receiver to complete the mating of the receivers. Inspection of the Action WARNING THERE SHOULD BE NO AMMUNITION PRESENT DURING THIS TEST. 1. Grasp the charging handle and dry-cycle the rifle several times (work the bolt all the way back and forth). This will serve two purposes.
OPERATING THE RIFLE Loading the Magazine Using appropriate ammunition, load the magazine in the normal manner. Ensure that cartridges are pushed all the way to the rear of the magazine. Load no more than 10 rounds. Safety There is a single thumb-lever that prohibits the trigger from being pulled. Position the lever pointed towards SAFE.
Inserting Magazine 1. Insert the magazine into the magazine well in the lower receiver, with magazine tilted at approximately a 45° angle (bullet tips upward). Insert the front of the magazine hook to its hinge, located in the front of the magazine well. 2. Swing the rear of the magazine up until it locks into place by means of the magazine catch. It should lock in with an audible click. Be aware that it is possible to insert the hook on the front of the magazine incorrectly.
Firing the Rifle WARNING DOUBLE HEARING PROTECTION SHOULD BE WORN WHEN FIRING SINCE HARMFUL LEVELS OF NOISE ARE GENERATED. WARNING THE SHOOTER MUST BE POSITIONED DIRECTLY BEHIND THE RIFLE WITH THE RECOIL PAD HELD FIRMLY AGAINST THE SHOULDER. FIRING THE RIFLE IN ANY OTHER POSITION COULD RESULT IN INJURY BY CONTACT WITH THE RIFLE OR RIFLE SCOPE. 1. Because the rifle is recoil-operated, the shooter must be positioned squarely behind the rifle, with the recoil pad firmly against the shoulder.
WARNING THE BOLT DOES NOT AUTOMATICALLY REMAIN TO THE REAR WHEN THE RIFLE OR MAGAZINE IS EMPTY WHICH CAN CAUSE INJURY OR DEATH FROM AN UNINTENTIONAL DISCHARGE. 4. After the magazine is emptied, or you are done firing, use the selector to place rifle in “SAFE” position and remove magazine. Pull and hold the charging handle to the rear while visually and physically checking for an EMPTY chamber.
SUPPRESSOR Your Barrett M107A1 Rifle System may include a Barrett Sound Suppressor. Auxiliary Muzzle Brake The Barrett suppressor system comes with a detachable auxiliary muzzle brake. The suppressor functions with or without this brake, depending on your preference. The brake will alleviate some recoil, but the most sound and flash suppression is accomplished without the brake. 1. To install the auxiliary muzzle brake, you will need T-25 Torx Wrench. 2.
Suppressor Installation 1. To install the suppressor, slide the coupling opening over the cylindrical muzzle brake, making sure the tabs clear the slots and the latch is in the “UNLOCK” position. 2. An indexing pin inside the suppressor locates on the rifle’s muzzle brake, ensuring proper alignment. 3. Tighten the suppressor lock ring by hand, engaging the notches with the latch and ensuring a secure fit. NOTE: It is very important that this ring be tightly secured to keep the suppressor in place. 4.
PREVENTIVE MAINTENANCE PROCEDURES General Maintenance 1. Ensure that all bearing surfaces and exposed parts, particularly those listed below, are clean and lightly coated with a CLP (cleaner, lubricant, preservative) Oil. a. Barrel b. Bolt and bolt carrier c. Mainspring housing d. Trigger assembly e. Transfer bar assembly f. Lower Receiver 2. Inspect all parts for fit and tighten or replace, as necessary. a. Inspect all parts (especially along welds) for cracks or damage and replace, if necessary. b.
CLEANING AND LUBRICATION WARNING UNLOAD AND CLEAR THE RIFLE BEFORE CLEANING. CAUTION DO NOT INSERT CLEANING RODS THROUGH THE MUZZLE. THE BARREL CROWN COULD BE DAMAGED WHICH WOULD SEVERELY DEGRADE THE ACCURACY OF THE RIFLE. CAUTION TO PROTECT THE RIFLE FROM CORROSION, THE RIFLE AND THE INTERIOR OF THE CARRYING CASE SHOULD BE MOISTURE FREE BEFORE THE RIFLE IS PLACED IN THE CARRYING CASE FOR STORAGE. Cleaning Procedure 1. The rifle should be cleaned and lubricated after each shooting session.
M107A1 RIFLE 28
29
TROUBLESHOOTING Malfunction 1. Failure to feed 2. Failure to chamber Inspect and Test Corrective Action 1. Sluggish action Clean and lubricate or (if cold) remove excess lubrication 2. Check to see if the mainspring buffer is dragging Replace the buffer if the head diameter is over 1.850 in. Replace the buffer if showing excessive/uneven wear 3. Check Magazine a. Proper installation b. Dirt/debris c. Damage a. Reinstall magazine into the receiver b. Clean magazine c. Replace magazine 4.
Malfunction Inspect and Test Corrective Action 4. Failure to lock or unlock 1. Check for obstruction between firing pin and bolt Disassemble and clean 2. Check for excessive dirt Clean chamber and barrel extension or debris in locking area 5. Failure to fire 4. Check bolt spring for damage and proper installation Replace or reinstall bolt spring 5. Check for broken or burred bolt latch or bolt latch spring Please contact Tech Support 1. Faulty ammunition Replace ammunition 2.
Malfunction Inspect and Test Corrective Action 7. Failure to eject Check for proper movement of ejector Have a Barrett Certified Armorer remove, clean, lubricate or replace ejector and/or spring as needed 8. Very hard recoil 1. Check for faulty/hot ammunition Replace or cool ammunition 2. Check for damaged or missing mainspring/buffer Replace/install mainspring or buffer as needed 3.
P/N 12927 5/18/2011 33
