FailZero M16/M4 BCG (No Hammer) – Black Nitride EXO Coating

The FailZero M16/M4 Bolt Carrier Group with EXO nickel boron coating delivers reliable cycling without the need for traditional lubricants. This full-auto profile BCG is machined to Mil-Spec dimensions and treated with FailZero's proprietary EXO coating, which embeds a self-lubricating layer directly into the metal surface. The result is reduced friction, easier cleaning, and consistent performance in adverse conditions. This version ships without a firing pin hammer for builders who already have one or prefer to source their own.

The black nitride finish over the EXO coating provides corrosion resistance and a low-glare appearance. The BCG is compatible with standard AR-15 uppers chambered in 5.56 NATO/.223 Remington. Installation is drop-in for anyone familiar with AR-15 assembly—no gunsmithing required. The coating reduces carbon buildup significantly, allowing you to wipe down the carrier with minimal scrubbing.

• Part Type: Bolt Carrier Group (Full-Auto Profile)
• Compatible Firearms: M16/M4, AR-15 (5.56 NATO/.223 Rem)
• Material: Mil-Spec Steel
• Finish: Black Nitride with EXO Nickel Boron Coating
• Installation: Drop-In
• Includes: Bolt Carrier, Bolt Assembly, Gas Key, Cam Pin, Firing Pin Retaining Pin (No Firing Pin Hammer)