B A R R E T T BARRETT FIREARM MANUFACTURING, INC. OPERATOR’S MANUAL .50 Caliber Rifle M82A1 BARRETT FIREARMS MANUFACTURING, INC. P.O. BOX 1077 MURFREESBORO, TN 37133-177 TELEPHONE 615-896-2938 FAX 615-896-7313 E-MAIL: mail@barrettrifles.
TABLE OF CONTENTS PAGE CHAPTER I 1.1 1.2 1.2.1 1.2.2 1.2.3 1.3 1.3.1 1.3.2 1.3.3 1.3.4 1.3.5 1.3.6 1.3.7 1.3.8 1.3.9 1.3.10 INTRODUCTION GENERAL INFORMATION EQUIPMENT DESCRIPTION AND DATA EQUIPMENT SPECIFICATIONS AND CAPABILITIES IDENTIFICATION AND DESCRIPTION OF MAJOR COMPONENTS ASSOCIATED EQUIPMENT PRINCIPLES OF OPERATION GENERAL FUNCTIONING FEEDING CHAMBERING LOCKING FIRING UNLOCKING COCKING EXTRACTION EJECTION SAFETY MECHANISM 1 1 1 1 3 4 5 5 6 6 6 7 7 8 8 9 9 CHAPTER 2 2.1 2.1.1 2.1.1.1 2.1.1.2 2.1.
CHAPTER 1 INTRODUCTION 1.1 GENERAL INFORMATION TYPE OF MANUAL: Operator’s instruction manual for fifty caliber Barrett model 82A1 rifle. PREPARATION FOR STORAGE OR SHIPMENT. Except in extreme situations, the M82A1 should always be stored and transported in its airtight, watertight carrying case. RIFLE REPAIR. Rifle repair will be accomplished by Barrett Firearms Manufacturing, Inc. In the event the M82A1 requires repair, it is to be sent as a complete assembly, packaged as described above. 1.
Table 1-1. Specifications and Capabilities SPECIFICATIONS Caliber: .50 BMG 12.7 x 99 mm Weight: 30 lbs (13.6 kg) unloaded Overall Length: (Assembled) 57 in (145 cm) Length: (Takedown Mode) 38 in (96.
1.2.2 IDENTIFICATION AND DESCRIPTION OF MAJOR COMPONENTS. Figure 1-2. M82A1 Scoped Rifle – Major Components (1) Upper Receiver, Complete. Sheet metal cover (1) combining and including the front and rear sights (2) and (5), telescope base (3), carrying handle (4), muzzle brake (6) and barrel (7). (2) Rear Sight Leaf. Peep style aperture with elevation markings for 100 to 1500 meters. (3) Scope Base. (4) Carrying Handle. Steel stock with a hard plastic handle. (5) Front Sight.
1.2.3 ASSOCIATED EQUIPMENT. The M82A1 Rifle (Figure 1-3) is comprised of M82A1 Rifle (1), Magazine (2), Airtight, Watertight case (3), and Cleaning Kit (4). Telescopic sights, shooting mats, and spare magazines are optional accessories. Figure 1-3.
1.3 PRINCIPLES OF OPERATION 1.3.1 GENERAL FUNCTIONING. The cycle of operation for the M82A1 Rifle is broken down into eight basic steps (more than one step may occur at the same time). For reference, see Figure 1-4 and the accompanying legend.
1.3.2 FEEDING. The force of the mainspring pushes the bolt (1), Figure 1-5, forward, toward the barrel extension (2), stripping a cartridge from the magazine and loading it into the chamber. The bolt carrier is moved to the rear by hand when first loading but the bolt carrier handle should be released fully to allow the bolt to come forward freely under spring pressure. The rifle will fire in the semiautomatic mode on subsequent firings. Figure 1-5. Feeding Procedure 1.3.3 CHAMBERING.
1.3.5 FIRING. The trigger (1), Figure 1-7, pivots on the trigger housing pin and presses on the transfer bar (2), causing the bar to rise. The transfer bar engages the sear (3) (housed in the bolt carrier), forcing it upward and out of engagement with the firing pin extension (4). The firing pin extension, under spring power, forces the firing pin (5) forward to strike the primer of the cartridge. Figure 1-7. Firing Procedures 1.3.6 UNLOCKING.
1.3.7 COCKING. As the bolt carrier recoils to the rear, the cocking lever (4), Figure 1-9, rides the transfer bar (5) back and down, causing it to disconnect from the trigger. The transfer bar is held down in the position by the disconnector and not released until pressure is released from the trigger. After disconnection, the cocking lever swings on its pin and overrides the transfer bar. The other end of the cocking lever protrudes into the bolt carrier and into the firing pin extension.
1.3.9 EJECTION. As soon as the fired case has been extracted and has cleared the rear of the barrel extension, it is expelled from the rifle by the spring-powered ejector (3). Figure 1-11. Ejection Procedures 1.3.10 SAFETY MECHANISM. There is a single thumb-lever (1), Figure 1-12, which prohibits the rifle from firing by blocking the trigger from rotating up, effectively preventing it from rotating the transfer bar on to the sear. Figure 1-12.
CHAPTER 2 MAINTENANCE OF THE RIFLE 2.1 INITIAL INSPECTION AND ASSEMBLY 2.1.1 INSPECTION - OF RIFLE’S MAJOR GROUPS. The rifle’s four major groups are packaged as shown in Figure 2-1. 1. 2. 3. 4. Upper Receiver Bolt Carrier Group Lower Receiver Bipod Assembly Ensure all components are present (see paragraph 1-7, page 1-4) and inspect for obvious damage, reporting any discrepancies to the Barrett factory. Detailed inspection should be conducted as follows: Figure 2-1.
2.1.1.1 INSPECTION - THE UPPER RECEIVER Figure 2-2. Upper Receiver (1) Barrel springs (1), must not be overstretched, and each coil should be tight, with no spaces between coils. (2) Impact bumpers (2) should be in good condition (not frayed, cracked, or twisted). (3) The muzzle brake (3) should be tight and fully screwed on (see 3.3.4, page 28 for installation procedures). (4) The upper receiver (4) should not be cracked, bent, or burred.
2.1.1.2 INSPECTION - THE BOLT CARRIER GROUP Figure 2-3. Bolt Carrier Group (1) Ejector and extractor (1) must be checked to ensure they are under spring tension, and neither chipped nor worn. (2) With firing mechanism decocked (use rear lock pin to depress sear (2), depress the bolt latch and manually work the bolt in and out, feeling for any roughness, which may indicate wear, corrosion, or dirt/grit in the carrier (4). (3) Push the bolt (5) into the carrier and inspect for firing-pin protrusion.
2.1.1.3 INSPECTION - LOWER RECEIVER Figure 2-4. Lower Receiver (1) With bolt carrier in place, pull it rearward and check to see that the mainspring (1) moves freely (full travel) and is not deformed. (2) Hold bolt carrier back and down approximately ¼ in (6 mm) under mainspring housing (2) (sheet metal closure). With the thumb safety (3) on fire, pull the trigger. Firing mechanism should function (a slight rise in bolt carrier is normal).
2.1.2 ASSEMBLY OF MAJOR GROUPS. 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. See Figure 2-5. (To retract, pull down on leg (1) and swing back into position along the receiver. If firing without using the bipod, fold them forward to preclude interference with the charging handle.
3. Standing above and to the rear of the lower receiver, grasp the charging handle (1), Figure 2-7, with the right hand, and carefully pull back, against tension, while withdrawing the midlock pin (2) from its retaining hole. Allow the bolt carrier (3) to come forward SLOWLY until there is no more spring tension and it rests in the lower receiver. Figure 2-7. Releasing Bolt Carrier From Storage Configuration 4. Carefully pick up the upper receiver. The barrel will be nested inside it for compact storage.
5. The barrel springs (1), Figure 2-8, at the front of the upper receiver, are held together by a spring yoke—the barrel key (2). Maintaining the downward tilt of the upper receiver (to keep the barrel (3) in place) firmly grasp the barrel key—not the springs—and pull it into place on the forward slot of the barrel. Work the key from side to side until it is firmly seated in the barrel slot. The upper receiver is now fully assembled. Figure 2-8. Positioning Barrel Key 6.
8. Lower and close the upper receiver (3), Figure 2-10, onto the lower receiver (4). Release the charging handle (1) slowly until bolt engages barrel (2). WARNING THE RIFLE MUST NOT BE FIRED WITHOUT BOTH THE MIDLOCK AND REAR LOCK PINS FIRMLY IN PLACE. SERIOUS INJURY OR DEATH COULD RESULT. Figure 2-10. Lowering Upper Receiver 9. Place the midlock pin (1), Figure 2-11, through the hole near center bottom of the rifle, until it snaps fully in to lock the upper (2) and lower (3) receivers together.
2.2 LOADING 1. 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. 2. Prior to inserting the magazine, 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. First, if there has been any damage to the sheet metal housing during shipping, the bolt carrier will not move freely.
4. With the safety in the safe position (safety lever horizontal (1), Figure 2-13) and the muzzle pointed in safe direction pull the charging handle to the rear until it stops, then release it (do not keep your hand on the changer handle). The rifle then loads and locks under its own spring power for all subsequent rounds. Figure 2-13. Rifle Safety on Safe 5. Because the rifle is recoil-operated, the shooter must be positioned squarely behind the rifle, with the recoil pad firmly against the shoulder.
2.3 UNLOADING RIFLE AND MAGAZINE 2.3.1 UNLOADING RIFLE. Place the rifle on safe (safety lever horizontal (1), Figure 2-13), press the magazine catch forward, towards the magazine, and remove the magazine. Pull the charging handle to the rear, which will eject any cartridge still chambered. (One method of indicating the rifle has been cleared is to take an empty cartridge case, insert it halfway into the ejection port so that the neck is visible, and ease the bolt forward onto it.
2.4.2 SPECIFIC MAINTENANCE. 1. Before Firing: a. Thoroughly clean and dry the bore and chamber (to be accomplished by inserting the cleaning rod into the rear (chamber) end of the barrel to avoid damaging the crown). CAUTION WHENEVER IT IS NECESSARY TO INSERT CLEANING RODS OR OTHER DEVICES THROUGH THE MUZZLE END OF THE BARREL, BE ESPECIALLY CAREFUL NOT TO DAMAGE THE MUZZLE CROWN, SINCE IT COULD AFFECT THE ACCURACY OF THE RIFLE. b.
springs, and holes. Apply lubrication before assembly and test their motion by hand. (7) Clean the remainder of the rifle with cotton-tipped swabs, general purpose brushes and rags. If the rifle is to be stored, make sure all metal surfaces have a light coating of preservative oil. 2.5.1 AFTER FIRING CLEANING INSTRUCTIONS (1) Clean barrel from the rear. Repeat this cleaning for three consecutive days, or until there is no longer any evidence of fouling in the bore.
2.6 TROUBLESHOOTING Table 2-2.
2.7 COMPONENT REPLACEMENT INTERVAL After approximately 4,000 rounds have been fired through the M82A1, the rifle should be detail inspected by a qualified armorer.
CHAPTER 3 DISASSEMBLY / ASSEMBLY PROCEDURES 3.1 DISASSEMBLY / ASSEMBLY OF MAJOR PARTS OF RIFLE (1) If the rifle is not already broken down into its main parts, begin by ensuring that the chamber is cleared. (2) Place the rifle on the safe (safety lever horizontal), see Figure 2-13, page 19, press the magazine catch forward, towards the magazine, and remove the magazine. Pull the charging handle to the rear, which will eject any cartridge still chambered.
3.2 MUZZLE BRAKE REMOVAL. (1) Using a T-30 Torx wrench, remove two muzzle brake screws. Take care not to lose muzzle brake washers. Use a small screwdriver or pick from cleaning kit to remove muzzle brake washers. Figure 2-17a. Removing muzzle brake screws (2) Begin by facing the rifle muzzle looking down the barrel. Place RH side muzzle brake on a hard wooden worktable while suspending aft end of rifle. The LH side of the muzzle brake should be approximately ¼ in (6 mm) above table.
3.3 REMOVAL OF BARREL KEY, BARREL SPRINGS, BARREL BUMPERS. CAUTION DO NOT PULL ON BARREL SPRINGS TO REMOVE THE BARREL KEY. THIS MAY CAUSE DAMAGE TO THE SPRINGS. (1) To remove the barrel key (1), Figure 2-18, and springs (2), use the 3 mm hex wrench to remove the four barrel spring screws (3) from both the barrel key and the front barrel bushing (4) of the upper receiver (5). Figure 2-18.
3.4 INSTALLATION OF BARREL SPRINGS, BARREL BUMPERS AND BARREL KEY. (1) Insert one end of both barrel springs (2) into the barrel key (1). Install two barrel spring screws (3) with the 1/8 in (3 mm) hex wrench. Insert the other end of the two barrel springs into the upper receiver (4). Install the remaining two barrel spring screws (3) using the 3 mm hex wrench. Figure 2-28.
WARNING THE RIFLE MUST NOT BE FIRED WITHOUT THE MUZZLE BRAKE FIRMLY IN PLACE ON THE BARREL. SERIOUS INJURY OR DEATH MAY RESULT. 3.5 MUZZLE BRAKE INSTALLATION. NOTE TIME REFERENCES ARE GIVEN AS VIEWED STANDING BEHIND RIFLE. (1) Screw the muzzle brake onto the barrel without using any shims. The goal is to hand-tighten it so that when standing behind it, it is oriented at an 10 o’clock—4 o’clock position with front sight facing upwards.
(4) Insert the muzzle brake washers and muzzle brake screws. (5) Tighten the muzzle brake screws with a torque wrench to 88-95 in-lb (10-10.8 N-m). Figure 2-32b.
LIMITED WARRANTY The Barrett Model 82A1 is warranted by Barrett Firearms Manufacturing Inc. to be free from defects in material and workmanship for a period of twelve (12) months from the date of purchase by the original purchaser. Under this warranty, the obligation of Barrett Firearms Manufacturing Inc. is limited to the free replacement (to the original purchaser) of any part which, under normal conditions of use, proves to be faulty because of a defect in material or workmanship.
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