Fully assembled and ready to drop into any mil-spec AR-15, M-16 or M-4 upper receiver, this full auto profile bolt carrier group from Fail Zero is a great choice for any upgrade or new build. EXO nickel boron coats all critical parts and provides permanent dry lubricity and corrosion resistance. This coating reduces friction and wear and increases the life of your weapon. Features and Specifications: Manufacturer Number: FZ-M164-01-SAH 5.56 NATO/.223 Remington compatible bolt and extractor Full auto profile bolt carrier Single stage semi-auto hammer Cam pin Carrier key Firing pin Material: Steel Finish: Nickel Boron from The Samson Armory (Product 881314861842)

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