Rise Armament AR-15 Bolt Carrier Groupf for .223 Rem/5.56mm NATO, Black Nitride Steel

OverviewThe RISE Armament AR-15 Bolt Carrier Group (BCG) manufactured with precision and individually inspected to ensure high-level performance. The easy-to-clean black nitride finish offers unmatched strength with each pull of the trigger.Key FeaturesHigh-strength and easy-to-clean black nitride finishIndividually MPI testedBolt: 9310 MPI testedCarrier: 8620 tool steel heat treated and case hardenedGas key: tool steel - grade 8 hardened fasteners and staked properlyCam pin: 4140 steelExtractor: tool steel - shot peened