The Fail Zero Bolt Carrier Group (brand part number 009-FZAR15-01-NH) is a complete, semi-auto BCG for 5.56mm/.223 AR-15 rifles, machined from steel and treated with Fail Zero’s EXO nickel-boron coating for smoother cycling and easier cleaning than a standard phosphate finish. The carrier is a drop-in fit for most mil-spec AR-15 uppers, and it ships as a complete assembly ready to install and run.

Key Specifications

• Chambered for 5.56mm/.223.
• Machined from steel with Fail Zero’s EXO nickel-boron treatment.
• Drop-in fit for most mil-spec AR-15 uppers.
• Built for semi-auto operation.
• Complete assembly includes the bolt and extractor.
• Also includes the carrier, cam pin, carrier key, and firing pin.

Frequently Asked Questions

Will this drop into my upper? Yes, it is a drop-in fit for most mil-spec AR-15 uppers.

Why choose a nickel-boron BCG? The EXO nickel-boron treatment cycles smoother and cleans up easier than a standard phosphate finish.

Buy the Fail Zero Nickel-Boron Bolt Carrier Group, 5.56mm Semi-Auto AR-15

A smoother-cycling, easier-to-clean BCG is a real quality-of-life upgrade for any AR-15 that sees regular range time. Order it from the Fail Zero lineup of AR bolt carrier groups at our Lubbock, Texas gun shop for fast, insured shipping.