The FailZero Bolt Carrier Group (brand part no. 009-FZM16/4-01-NH) is a complete, 5.56/.223-compatible carrier group that drops into most mil-spec M16, M4, or AR-15 upper receivers. FailZero coats every critical part in its EXO Nickel Boron finish, a permanent dry lubricant that boosts wear and corrosion resistance while cutting friction for smoother cycling. The carrier uses M16-profile geometry, commonly called a "full-auto" carrier for its added mass, which many shooters run in semi-auto AR-15/M4 builds for smoother cycling and better compatibility with suppressors.

Key Specifications

• Compatible with 5.56/.223.
• Drop-in fit for most mil-spec M16, M4, or AR-15 uppers.
• EXO Nickel Boron coating on all critical parts.
• Provides permanent dry lubricity.
• Increases wear and corrosion resistance.
• Reduces friction for smoother cycling.
• Uses M16-profile carrier geometry for added mass and smoother cycling.
• Coated components include the bolt, extractor, carrier, cam pin, carrier key, and firing pin.
• Measures 10.65 inches in length.

Frequently Asked Questions

What caliber is this BCG compatible with? 5.56/.223.

What does the EXO Nickel Boron coating do? It provides permanent dry lubricity and increases wear and corrosion resistance.

What uppers does this BCG fit? Most mil-spec M16, M4, or AR-15 uppers.

Buy the FailZero Bolt Carrier Group

Drop a low-friction, corrosion-resistant BCG into your AR-15/M4. Order it from our AR bolt carrier groups selection at our Lubbock, Texas gun shop for fast, direct shipping.