Fail Zero 5.56 Black Nitride Bolt Carrier Group

The Fail Zero 5.56 Black Nitride Bolt Carrier Group is a complete bolt carrier assembled for drop-in installation into mil-spec AR-15/M16/M4 upper receivers. Critical components receive a black salt bath nitride finish to improve wear and corrosion resistance. This version is the full-auto style carrier and is supplied without a hammer; the firing pin is finished in chrome.

Key Specifications

• The caliber compatibility is 5.56mm.
• The product type is a Bolt Carrier Group.
• The listed model compatibility is M16/M4.
• The exterior finish is Black Nitride.
• The primary material is Steel.
• Critical components receive a Black Salt Bath Nitride treatment for wear and corrosion resistance.
• The unit includes a firing pin with a chrome finish.
• Installation is a drop-in fit for most mil-spec upper receivers.
• The configuration is listed as No Hammer.
• Manufacturer-listed dimensions are 1.75 x 3.80 x 10.95.

Engineered and finished to integrate with mil-spec AR platforms, this Fail Zero BCG combines nitride-treated surfaces and precision manufacturing to provide durable, long-lasting service in demanding use. Its drop-in design and attention to critical part finishes make it a practical choice for builders and technicians seeking a high-quality replacement or upgrade for compatible M16/M4-style uppers.