The Faxon 5.56 M16 Nitride TiN Bolt Carrier Group (brand part no. FF556BCGCNITRIDE-TiN) is a full M16-profile BCG built for AR-15/M16-pattern rifles chambered in 5.56 NATO. Faxon treats mil-spec as a starting point rather than an end point, machining the bolt from 9310 tool steel and nitriding the full assembly for greater surface hardness, lower friction, and better corrosion resistance than typical chrome or phosphate-coated groups. Every bolt is magnetic-particle inspected (MPI tested) to confirm it is free of material defects before it ships. The bolt lugs are chamfered 45 degrees to keep the action running reliably even under high-pressure hand loads. It is a durable, high-round-count upgrade for a rifle-length AR build.

Key Specifications

• Full M16-profile carrier, heavier than a standard M4 carbine-profile carrier.
• Bolt machined from 9310 tool steel for strength and fatigue resistance.
• Assembly is nitrided for increased surface hardness and corrosion resistance.
• Finished in Titanium Nitride (TiN) for a low-friction, gold-toned coating.
• Every bolt is MPI tested to confirm it is free of material defects.
• Bolt lugs are chamfered 45 degrees for reliable lock-up under high-pressure loads.
• Chambered for 5.56 NATO/M16 rifle-length AR platforms.

Frequently Asked Questions

What steel is the bolt machined from? 9310 tool steel, chosen for strength and fatigue resistance over standard carpenter steel.

Is this bolt carrier group tested? Yes, every bolt is MPI tested to confirm the material is sound and defect-free.

What does the TiN coating do? It adds a durable, low-friction, corrosion-resistant surface with a distinct gold tone.

Buy the Faxon 5.56 M16 Nitride TiN Bolt Carrier Group

Order the Faxon Firearms 5.56 M16 Bolt Carrier Group from our Lubbock, Texas gun shop and give your rifle-length AR a durable, high-round-count AR bolt carrier group. Add it to your cart for fast, insured shipping direct to your door.