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Description: APF AR-15 / M16 Bolt Carrier Group Nitride. Manufactured from quality 9310 steel with Nitride black finish this bolt carrier group is produced by APF Alex Pro Firearms for the AR-15 and M16 rifle/pistol platforms chambered in 5.56x45mm .223 Rem and .300 Blackout. This bolt carrier group showcases reliable durability packs heat treated components and has been machined to mil-spec standards making it perfect for completing a new workshop custom rifle build or as an immediate upgrade to a worn or damaged component.