Complete M16 Black Nitride Bolt Carrier GroupNitrided M16 Bolt Carrier Group, made from 8620 steel, Bolt is made from 9310 steel MPI Tested. The 223 Bolt and Bolt Carrier Assembly comes complete with cam pin , firing pin and firing pin retainer. Features include:.223 / 5.56 bolt assembly is compatible with .300BLKFully mil-spec constructionDurable Nitride finish9310 steel bolt is MPI-tested8620 steel full-shroud M16 style bolt carrierProperly staked gas key


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