Nickel Boron Steel Bolt Carrier – AR15

Coated bolt carrier with Key (full auto version) for AR15, M16, or M4 machined from Mil-Spec 8620 aircraft quality steel with shrouded firing pin. Bolt carrier includes a 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. Mil-Spec M-16 Bolt Carrier and Key: Mil-Spec Bolt Carrier Machined from 8620 Aircraft Quality Steel and heat treated to 60-61 RC Mil-Spec Gas Key Key Staked with Grade 8 Screws, per Mil-Spec Full Auto Carrier (Backward compatible with all semi-auto rifles)