CMC Triggers 81631 Bolt Carrier Group Enhanced 223 Rem 5.56x45mm NATO 300 Blackout Black Nitride 8620 Steel AR-15

CMC Triggers Enhanced Bolt Carrier Group improved fatigue strength increases wear resistance exceptional lubricity and low friction coefficient withstands corrosion per ASTM spec B117 with enhanced cosmetic appeal and better corrosion protection at an equivalent or lower cost than hard chrome-nickel plating.