Wilson Combat M16 Bolt Carrier Assy 5.56 Nato Polished Nickel Boron

The Wilson Combat M16 bolt carrier assembly for 5.56 NATO is a precision replacement built to the same standard Wilson Combat uses in their custom rifles. This is the kind of spare part every serious AR owner should have on hand—a complete, drop-in bolt carrier group that's ready to go into any quality 5.56-based rifle. Wilson Combat manufactures their carriers and bolts domestically to Mil-Spec standards, with close attention to material selection, heat treatment, and final inspection that separates quality components from the rest of the market.

Construction starts with Carpenter No. 158 steel for the bolt itself, shot peened to increase strength and fatigue resistance. The extractor and ejector are tool steel, and the carrier is 8620 steel with a machined Mil-Spec gas key secured via Grade 8 fasteners and properly staked. Every bolt is Magnetic Particle Inspected (MPI), and carriers are randomly subjected to High Pressure Testing (HPT) to catch potential issues before they reach your rifle. The polished nickel-boron finish provides a durable, low-friction surface that resists corrosion and simplifies cleaning.

This is a full-auto profile carrier, meaning it carries slightly more mass than a semi-auto equivalent—a feature that can benefit short-barreled setups, suppressed rifles, and carbine-length gas systems by providing a bit more mass to regulate the action. The heavier profile will function flawlessly in any 5.56 semi-automatic rifle; there's no legal restriction on owning a full-auto-profile carrier in a civilian gun. The assembly includes the properly fitted extractor spring and all internal components necessary for reliable function.

If you've built or repaired AR rifles before, you know that quality spare parts are insurance. This bolt carrier group is precision machined and finished to the standard Wilson Combat demands for their own firearms.

Key Features

• Carpenter No. 158 steel bolt, shot peened for strength
• 8620 steel carrier with machined Mil-Spec gas key
• Tool steel extractor and ejector per Mil-Spec
• Full-auto profile carrier for reliable function in short-barreled and suppressed rifles
• Grade 8 fasteners, properly staked
• Magnetic Particle Inspected bolts; High Pressure Tested carriers
• Polished nickel-boron finish resists corrosion and friction
• Drop-in compatible with any 5.56 NATO AR rifle

Specifications

Frequently Asked Questions

Will this bolt carrier work in my 5.56 AR-15?

Yes. This assembly is a drop-in fit for any quality 5.56 case head–based AR rifle, including .223 Remington, .300 Blackout, .204 Ruger, and 7.62x40 WT. It's Mil-Spec compatible and will function reliably in semi-automatic rifles.

What's the difference between a full-auto and semi-auto carrier?

This is a full-auto profile carrier, which is slightly heavier than a semi-auto version. The added mass helps regulate the action in short-barreled rifles, carbine-length gas systems, and suppressed setups by reducing cyclic rate. Both profiles are completely interchangeable and legal to own in semi-automatic rifles—the full-auto design simply provides a bit more inertia for certain configurations.

What quality checks does Wilson Combat perform?

Every bolt is Magnetic Particle Inspected to catch internal defects, and carrier assemblies are randomly subjected to High Pressure Testing (HPT). The gas key is properly staked with Grade 8 fasteners and verified during final inspection.

Is this the same carrier Wilson Combat uses in their custom rifles?

Yes. Wilson Combat manufactures these to the same Mil-Spec standard and material specifications used as the foundation for their complete rifles.