General Assembly

To assemble the gun, replace the groups and assemblies in reverse order of their removal in disassembly.

a. Barrel Buffer Assembly and Barrel Buffer Body Group. Replace the barrel buffer assembly in the barrel buffer body group, with the key on the spring guide to the right. This key must fit in its slot in the right side of the barrel buffer body. Turn the barrel buffer tube until the screwdriver slot (in the rear of the tube) is vertical and the arrow is pointing to the right. The stud on the tube lock will now engage the serrations in the barrel buffer tube to keep the tube from turning. Push the barrel buffer assembly fully forward (Figures 2- 15 and 2-16).

Tdi Bmg Heavy Machine Gun
Figure 2-16. Replacing the barrel buffer tube.

b. Barrel Buffer Group and Barrel Extension Group. To join the two groups together, hold the barrel buffer group in the right hand, with the index finger supporting the accelerator. Join the notch on the shank of the barrel extension group with the cross-groove in the pistol rod of the barrel buffer assembly. At the same time, align the breech lock depressors with their guideways in the sides of the barrel extension, ensuring that the tips of the accelerator are against the rear end of the barrel extension (claws against the shank) (Figure 2-17). Push the groups together. As the accelerator rotates to the rear, press down on its tips to ensure positive locking of groups. Place the groups in the receiver, and push them forward until the barrel buffer body spring lock snaps into position. When the parts are properly locked in place, the barrel buffer tube should protrude about 1 1/8 inches from the rear of the barrel buffer body group.

c. Bolt. Place the bolt in the receiver, with the top of the cocking lever forward and the extractor down. The barrel extension, barrel buffer, and bolt groups may be assembled and returned to the receiver together (Figure 2-18).

^ ACCELERATOR CLAWS

Figure 2-17. Joining the barrel extension group and barrel buffer group.

^ ACCELERATOR CLAWS

Figure 2-17. Joining the barrel extension group and barrel buffer group.

Figure 2-18. Returning the barrel extension, barrel buffer, and bolt groups together.

d. Bolt Stud. Align the stud hole in the bolt with the clearance hole and replace the bolt stud, ensuring that the collar of the stud is inside the sideplate (Figure 2-19).

Figure 2-18. Returning the barrel extension, barrel buffer, and bolt groups together.

d. Bolt Stud. Align the stud hole in the bolt with the clearance hole and replace the bolt stud, ensuring that the collar of the stud is inside the sideplate (Figure 2-19).

Figure 2-19. Replacing the bolt stud.

e. Driving Spring Group. Press up on the bolt latch and push the bolt all the way forward by pushing on the bolt stud only. Place the end of the driving spring rod in its hole in the rear of the bolt, and push forward on the driving spring group and the barrel buffer tube. Press in and to the right on the head of the driving spring rod and place the retaining pin in its seat in the right sideplate.

NOTE: At this time, the barrel buffer tube should be completely inside the receiver. If not, the barrel buffer body spring is not properly seated.

f. Backplate Group. Hold the backplate with the latch down and the trigger up; place the backplate guides in their guideways. Hold out on the latch lock and tap the backplate into position until the latch snaps into place (Figure 2-20). Release the latch lock and pull up on the backplate group to ensure it is firmly seated.

CAUTION

Do not use the driving rod to drive the bolt forward from the rear position. This may damage the driving spring group and cause a stoppage._

CAUTION

Do not use the driving rod to drive the bolt forward from the rear position. This may damage the driving spring group and cause a stoppage._

Figure 2-20. Replacing the backplate group.

g. Barrel. Pull the retracting slide handle to the rear until the lug on the barrel locking spring invisible through the 3/8-inch hole in the right sideplate. Place the smallest loop of a caliber .50 link, or suitable spacer, between the trunnion block and the barrel extension. Screw the barrel all the way into the barrel extension; then unscrew the barrel two notches. Remove the link and close the cover. This completes general assembly.

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