The FailZero Nickel Boron BCG is a fully assembled M16/4 Full-Auto bolt carrier group that drops into most mil-spec M16, M4 or AR-15 upper receivers (brand part no. 009-FZM16/4-01-NH). FailZero coats every critical part in its patented EXO Nickel Boron, a treatment that gives the group permanent dry lubricity and extreme durability. The bolt and extractor are compatible with 5.56, .223 and 300 Blackout, so it suits the common AR-15 chamberings. Builders pick a coated carrier group like this to cut friction and improve the overall performance of the rifle.

Key Specifications

• The carrier uses the M16/4 Full-Auto profile, the full-auto-style carrier the maker offers for AR-15 and M4 rifles.
• The bolt and extractor are compatible with 5.56, .223 and 300 Blackout, so the group is not tied to a single chambering.
• The group comes fully assembled and ready to install, so there are no individual parts to source.
• It fits most mil-spec M16, M4 and AR-15 upper receivers as a drop-in replacement.
• Every critical part carries EXO Nickel Boron coating, the patented FailZero treatment for the whole group.
• The coating provides permanent dry lubricity on the moving parts.
• It adds extreme durability and increased wear and corrosion resistance to the coated surfaces.
• FailZero says the coating reduces friction and improves the overall performance of the rifle.
• The coated parts are the bolt, extractor, bolt carrier, cam pin, carrier key and firing pin.

Frequently Asked Questions

Which upper receivers does this bolt carrier group fit? FailZero states that it is ready to drop into most mil-spec M16, M4 or AR-15 upper receivers.

Which chamberings can the bolt run? The bolt and extractor are compatible with 5.56, .223 and 300 Blackout.

Which parts have the Nickel Boron coating? The bolt, extractor, bolt carrier, cam pin, carrier key and firing pin are all treated with EXO Nickel Boron.

Buy the FailZero Nickel Boron M16/4 Full-Auto Bolt Carrier Group, 5.56/.223

Nickel boron carrier groups are chosen for how little friction they add and how easy they are to wipe clean. This FailZero group ships assembled, so the swap is a matter of pinning the new carrier into your upper. Order it with our other AR bolt carrier groups from our Lubbock, Texas gun shop for fast, direct shipping.