The major assemblies of GAU‐21 Machine Gun (Figure 1) are the Barrel Assembly, Receiver Assembly, _______________, Barrel Buffer Assembly, Feed Cover Assembly, __________________, Auxiliary Return Springs Assembly, and Trigger Assembly. (300-1)
A. Ejector Assembly, Sear Slide
B. Breech Lock, Belt Holding Pawls Assembly
C. Back Plate Latch Lock, Buffer Block Subassembly
D. Feed Tray, Barrel Extension Assembly