The Fail Zero M16/M4 Bolt Carrier Group (brand part no. FZ-M164-01-NH-MATTE) comes fully assembled and ready to drop into most mil-spec M16, M4, or AR-15 upper receivers, sold without a hammer for builders sourcing that piece separately. Critical surfaces carry Fail Zero’s EXO Nickel Boron coating, delivering permanent dry lubricity along with increased wear and corrosion resistance compared to a standard phosphate-finished carrier group. The M16/M4-profile carrier is the full-auto-cut version of Fail Zero’s BCG line, matching the geometry of a mil-spec M16/M4 carrier rather than a semi-auto-only profile.

Key Specifications

• Built to the M16/M4 carrier profile.
• Ships fully assembled, ready to drop into most mil-spec uppers.
• Sold without a hammer.
• Coated with EXO Nickel Boron technology for permanent dry lubricity.
• Finished in matte.
• Increases wear and corrosion resistance over a standard finish.

Frequently Asked Questions

What’s different about the M16/M4 profile? It matches the carrier geometry of a mil-spec M16/M4 bolt carrier group rather than a semi-auto-only profile.

Does this include a hammer? No, it ships without one.

Buy the Fail Zero M16/M4 Bolt Carrier Group, No Hammer

Upgrade to a slicker-cycling, more durable BCG. Order the Fail Zero bolt carrier group from our AR15 bolts selection at our Lubbock, Texas gun shop, and we’ll get it ready to ship as soon as it’s available.