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Upgrade your AR15 with the Fail Zero M16/M4 Bolt Carrier Group, featuring EXO Nickel Boron coating for unmatched durability and corrosion resistance. This BCG comes fully assembled and fits seamlessly into most mil spec M16, M4, or AR15 upper receivers. Enjoy permanent dry lubricity, ensuring smooth operation and longevity. Enhance your firearm’s performance with this top-tier BCG from Fail Zero.
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