Chapter Disassembly And Assembly


6» General a. Types of Disassembly and Assembly. The two classifications of disassembly and assembly are:

U) General disassembly and assembly. Re-moving: and replacing major groupa and assemblies of the gun.

*2) Detailed disassembly and assembly. Re moving: and replacing all component parts of each major group and assembly.

b. Changing Parts. When time is critical and a major group or assembly is available, a broken part can be replaced by substituting a complete group or assembly containing the part. When a major group or assembly within the receiver is replaced, headspace and timing must be set.


7. Procadur*

General disassembly consists of removing the major groups and assemblies for inspection or cleaning.

a, Clearing the Gun. Before disassembly can be conducted, the gun must be cleared as prescribed in paragraph 15.

b. Barrel group. Turn the cover latch and raise the cover group (fig 4). Grasp the retracting slide handle with the right hand» palm up, and pull the recoiling parts to the rear until the lug on the barrel locking spring alines with the %-inch hole in the right sideplate of the receiver {just below the feed way exit). The barrel can be turned only when the lug is alined with the %-inch hole. Place the smallest loop of a caliber .50 link, or suitable spacer, between the trunnion block and the barrel extension {fig 5 and 6)« This holds the barrel lock-ing spring lug alined with the %-inch hole in the right sideplate. Unscrew the barrel from the receiver (fig 7). Be careful not to damage the threads or barrel locking notches when setting the barrel down. Pull back slightly on the retracting slide handle and remove the link or spacer from the receiver.

e. Baekplate Group. Inture that the bolt latch release is in the up position, free of the bolt latch release lock. If it is not, push down on the bolt latch release and turn the buffer tube sleeve to the right to free it (fig 8). The bolt must be forward before the bookplate is removed. If the bolt Is to the rear, push down on the bolt latch release allowing the bolt to go forward.

Caution. Care must be taken to prevent the bolt from slamming forward with the barrel removed.

Use the retracting slide handle to ease the bolt forward after the bolt latch is released. The back* plate latch lock and latch are below the buffer tube. Pull out on the lock and up on the latch; remove the baekplate by lifting it straight up (tig d. Driving Spring Rod Assembly. The inner and outer driving springs and driving spring rod are located inside the receiver next to the right sideplate (flg 10). Push in on the head of the driving spring rod and push to the left to remove the driving spring rod retaining pin from its seat in the right sideplate. Pull the driving spring assembly to the rear and out of the receiver.

Caution. Never attempt to cock the gun while the baekplate is off and the driving spring assembly is In place« If the baekplate is off and the driving spring assembly is compressed, the retaining pin on the driving spring rod can slip from its seat In the sideplate and could cause serious injuries to anyone behind the gun.

e. Bolt Stud. Grasp the retracting slide handle and give it a quick jerk, freeing the bolt from the barrel extension. Aline the shoulder on the bolt stud with the clearance hole in the bolt slot on the rgbt sideplate, and remove the bolt stud (flg 11).

Figur* i. Raising thé cover.

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