Cryptic 458 SOCOM/.450 Bushmaster Bolt Carrier Group (BCG) - Complete

Cryptic 458 SOCOM/.450 Bushmaster Bolt Carrier Group - Complete\n\nOverview\nCoated 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 chrome lined and heat treated; gas key 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 Inspected).\n\nSpecifications\n- Caliber: .450 Bushmaster, .458 SOCOM\n- Gun Make: AR Platform\n- Gun Model: M16, M4, AR-15\n- Hand: Ambidextrous\n- Weight: 11.5 oz\n- Condition: New\n- Included Accessories: Standard\n\nPackage Contents\n- Gas Key\n- Key Staked with Grade 8 Screws\n- Bolt w/ Spring and Ejector\n- Extractor w/ Spring and viton O-ring\n- Firing Pin\n- Cam Pin\n\nWhat firearm models does the manufacturer say Cryptic 458 SOCOM/.450 Bushmaster Bolt Carrier Group (BCG) - Complete is compatible with?\nAR-15, M4, M16