Cryptic 6.5mm Grendel II Bolt Carrier Group (BCG) - Complete

Cryptic 6.5mm Grendel II Bolt Carrier Group (BCG) - Complete Coated Bolt Carrier Group BCG (full auto version) for AR15, M16, or M4 machined from Mil-Spec 8620 aircraft quality steel with shrouded firing pin and Mil-Spec chrome lined interior. BCG includes the proper chrome lined and heat treated gas key. Gas key is secured to carrier with Grade 8 fasteners and properly staked per Mil-Specs. This ensures a strong staking and proper gas system functioning. 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). Specifications for Cryptic 6.5mm Grendel II Bolt Carrier Group (BCG) - Complete: - Manufacturer: Cryptic - Finish: Chrome Plated - Fabric/Material: 8620 Aircraft Quality Steel, Carpenter 158 Steel - Carrier Material: 8620 Steel - Bolt Material: Steel - Caliber: 6.5mm Grendel II - Gun Make: AR Platform - Gun Model: M16, M4, AR-15 - Hand: Ambidextrous - Weight: 11.55 oz - Condition: New - Additional Features: Thickness - 2-3 microns - Included Accessories: Standard Package Contents: - Cryptic 6.5mm Grendel II Bolt Carrier Group - Complete - Gas Key - Key Staked with Grade 8 Screws - Bolt w/ Spring and Ejector - Extractor w/ Spring and viton O-ring - Firing Pin - Cam Pin What firearm models does the manufacturer say Cryptic 6.5mm Grendel II Bolt Carrier Group (BCG) - Complete is compatible with? The manufacturer suggests that Cryptic 6.5mm Grendel II Bolt Carrier Group (BCG) - Complete is compatible with AR-15, M4, M16