Fail Zero 9mm AR9 Bolt Carrier Group - Black Nitride

The Fail Zero 9mm AR9 Bolt Carrier Group is a fully assembled, drop-in 9mm BCG designed for most 9mm AR-platform rifles and pistols. Machined from 8620 heat-treated steel to the same standard as Mil-Spec 5.56 carriers, this BCG is purpose-built for dedicated 9mm AR uppers and runs reliably with both Glock and Colt style magazines, giving builders flexibility when configuring their pistol-caliber AR.

The carrier and critical components are finished in Black Nitride (Salt Bath Nitride), a treatment that hardens the surface, reduces friction, and provides excellent corrosion resistance for long service life. The staked carrier key is properly secured for dependable operation, and the assembly weighs in at approximately 14.5 oz.