Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group (BCG)

Bolt carrier group for AR15, M16, or M4 compatible with semi and full auto versions. Carrier is machined from Mil-Spec 8620 tool steel with shrouded firing pin and Mil-Spec chrome lined interior. BCG includes the Mil-Spec chrome lined and heat treated gas key. Gas key is sealed then secured to carrier with Grade 8 fasteners and properly staked per Mil-Specs. This ensures proper gas system functioning. The bolt assembly is CNC machined from Mil-Spec Carpenter No. 158 steel then shot peened for increased strength per Mil-Spec; includes tool steel extractor with Wolff spring, viton O-ring , black insert; tool steel ejector pin spring; firing pin chromed finished with firing pin retaining pin and cam pin. Total weight completely assembled 8.2oz. HPT (High Pressure Batch Tested) and MPI (Magnetic Particle Inspected). Specifications for Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group (BCG): Manufacturer: Cryptic Fabric/Material: 4140 Billet Tool Steel, Carpenter 158 Steel Cartridge: .300 AAC Blackout, 5.56x45mm NATO, .223 Remington Gun Make: AR Platform Gun Model: M16, M4, AR-15 Weight: 8.2 oz Features of Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group (BCG) Mil-Spec CNC Machined from 8620 Tool Steel case hardened to 58 60 rockwell with chrome lined interior Mil- Spec Chrome Lined Gas Key Key Staked with Grade 8 Screws, per Mil-Spec Mil-Spec Carpenter 158 Bolt Mil-Spec Ejector w/ Spring Mil-Spec Extractor w/ Wolff Spring, viton O-ring and insert Mil-Spec Firing Pin w/ Chrome Finish Mil-Spec Cam Pin BCG Weight 8.2oz. Package Contents: Cryptic .223 / 5.56 / .300 AAC Blackout Low Mass Steel Bolt Carrier Group