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Fail Zero 5.56 BCG NiB



Fail Zero 5.56 BCG NiB


This Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most mil spec AR-15 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
  • Extreme durability
  • Dry lubricity
  • Corrosion resistant


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