• Nickel Boron coated for optimum performance
  • Properly staked gas key per Mil-Spec requirements
  • Heat treated and shot peened per Mil-Spec Requirements
  • MPI tested


  • Caliber: 5.56 NATO / .223 Rem / 300 Blackout
  • Weight: 11.5 oz.
  • Material:
    • Carrier: 8620 Steel
    • Gas Key: 4130 Steel
    • Gas Key Screws: 4140 Steel
    • Cam Pin: 4340 Steel
    • Bolt: 9310 Steel
    • Extractor: E4140 Steel
    • Firing Pin: 420SS Steel
  • Finish: Nickel Boron
  • Profile: M16


  • AR-15


  • 1x AB Arms Nickel Boron AR-15 Bolt Carrier
  • 1x Nickel Boron Gas Key (Installed)
  • 2x Gas Key Screws (Installed)
  • 1x Nickel Boron Bolt
  • 1x Cam Pin
  • 1x Firing Pin


AB Arms offers their Nickel Boron Bolt Carrier Group for the AR-15 user who demands excellence from every component of their rifle.

The bolt carrier group is machined from the toughest steel and topped off with an impenetrable layer of nickel boron. This coating offers unfaltering protection from wear and corrosion that would ordinarily degrade a BCG over years of heavy use. The coating is also uniquely resistant to fouling, dramatically reducing the amount of time you'll spend cleaning the bolt carrier group after a long day on duty or at the range. This coating is built to last and will not wear off, flake away, or degrade even under the most constant use.

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