Fail Zero 6.5 Grendel AR-15 Bolt Carrier Group - No Hammer - EXO Nickel Boron

The Fail Zero 6.5 Grendel Bolt Carrier Group is a fully assembled, drop-in BCG purpose-built for AR-15 upper receivers chambered in 6.5 Grendel (Type II). It carries Fail Zero's proprietary EXO Nickel Boron plating across every critical surface - bolt, carrier, gas key, and firing pin - for a slick, low-friction, self-lubricating finish that resists carbon adhesion and corrosion.

This is the No Hammer (NH) configuration, sold without a hammer so the shooter can pair it with their existing AR-15/M16 fire control components. The carrier is machined to Mil-Spec tolerances and drops directly into any standard 6.5 Grendel upper receiver for a clean, drop-in fit.

The nickel boron plating is what sets Fail Zero apart: the hardened finish dramatically reduces fouling buildup compared to traditional phosphate or nitride BCGs, making field cleaning faster and keeping the bolt cycling smoothly over long strings of fire. For builders assembling a precision 6.5 Grendel AR-15 or replacing a worn BCG in an existing upper, this assembly delivers the smooth, reliable function Fail Zero is known for.