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The carrier comes with a black topcoat/exterior with FailZero EXO Nickel Boron underneath. We've introduced this carrier to provide non-reflective properties, resulting in a Tactical Advantage. This Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most mil spec M16, M4 or AR15's. Nickel Boron treated parts include: Bolt & Extractor (5.56/.223 compatible) Bolt Carrier Extractor Cam Pin Carrier Key Firing Pin from MSR Arms (Product FZ-M16/4-01-NH-BLACK)

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