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This Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most mil spec AR15 upper receivers. All critical parts are coated with EXO Nickel Boron technology that provides permanent dry lubricity, extreme durability and increases both wear and corrosion resistance. Nickel Boron treated parts include: Bolt & Extractor (5.56/.223 compatible), Bolt Carrier, Extractor, Cam Pin, Carrier Key, Firing Pin from Sentry Arms (Product FZ-AR15-01-NH-MATTE)

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