7.62x39; NiB-X coating; Bolt - Case hardened 9310, shot peened, magnetic particle inspected; Extractor - Manufactured, heat-treated, and hardened; Firing Pin - Manufactured, heat-treated, hardened, chromed and certified per Government drawings; Gas Key - Hardened to USGI specifications and attached using grade 8 hardened fasteners; Cam Pin - Manufactured, heat treated, hardened and certified per government drawing; Carrier - M4/16 style full auto (heavier) functions in AR15 and M4/16 platforms, 8620 material, heat treated and case hardened