The FailZero 5.56 Black Nitride Bolt Carrier Group (brand part no. FZBLACKNITRIDENH) is a fully assembled, M16/M4-profile BCG ready to drop directly into a mil-spec AR-15 upper receiver. FailZero finishes every critical part in Black Salt Bath Nitride, boosting durability and extending service life against both wear and corrosion. The firing pin gets a chrome finish for added reliability, rounding out a BCG built to run hard without extra maintenance.

Key Specifications

• Chambered for 5.56 NATO.
• M16/M4 carrier profile.
• Ships fully assembled, ready to drop into a mil-spec upper.
• All critical parts finished in Black Salt Bath Nitride for durability and corrosion resistance.
• Firing pin has a chrome finish for added reliability.
• Weighs approximately 0.81 lbs.

Frequently Asked Questions

What upper receivers does this BCG fit? Any mil-spec 5.56 AR-15 upper.

What finish is used on this BCG? Black Salt Bath Nitride on the critical parts, with a chrome-finished firing pin.

Buy the FailZero 5.56 Black Nitride Bolt Carrier Group

Drop in a durable, nitride-finished BCG built to run hard. Order it from our AR bolt carrier groups selection at our Lubbock, Texas gun shop for fast, direct shipping.