Fail Zero 6mm ARC Bolt Carrier Group EXO Nickel Boron No Hammer

The Fail Zero 6mm ARC Bolt Carrier Group is a fully assembled, drop-in BCG purpose-built for the 6mm ARC cartridge. Built around a balanced, properly weighted full-auto profile carrier, this BCG drops directly into most Mil-Spec AR-15 upper receivers chambered in 6mm ARC, delivering reliable cycling matched to the cartridge's pressure curve.

The bolt and carrier are finished in Fail Zero's signature EXO Nickel Boron coating, producing a hard, low-friction silver surface that shrugs off carbon fouling, resists corrosion, and cleans up fast after extended range sessions. The BCG is machined from steel for the mass and durability an AR-15 platform demands. This configuration ships without a hammer installed, giving builders the freedom to pair it with their preferred hammer component or use it as a direct replacement in an existing 6mm ARC build.

Drop-in ready for Mil-Spec AR-15 uppers chambered in 6mm ARC, this Fail Zero BCG is a straightforward upgrade or replacement for any 6mm ARC build.