Cryptic 6.8mm SPC/.224 Valkyrie/.338 Spectre Bolt Carrier Group (BCG) - Complete

Cryptic 6.8mm SPC/.224 Valkyrie/.338 Spectre Bolt Carrier Group - Complete. Coated Bolt Carrier Group BCG (full auto version) for AR-15, M16, or M4 machined from Mil-Spec 8620 aircraft quality steel with shrouded firing pin and Mil-Spec chrome lined interior. Gas key is chrome lined and heat treated, secured to carrier with Grade 8 fasteners and properly staked per Mil-Specs. The bolt assembly is CNC machined from Mil-Spec Carpenter No. 158 steel and shot peened for increased strength per Mil-Spec. HPt (High Pressure Batch Tested) and MPI (Magnetic Particle Inspect). Weight 11.55 oz. Caliber options: .338 Spectre, .224 Valkyrie, 6.8 SPC. Compatible with AR-15 platforms (M16, M4). Package contents include Gas Key, Bolt with Spring and Ejector, Extractor with Spring and viton O-ring, Firing Pin, Cam Pin.