Faxon Firearms 5.56 Gunner Lightweight Bolt Carrier Group - Nitride Finish

The Faxon Firearms 5.56 Gunner Lightweight Bolt Carrier Group delivers a serious upgrade for AR builders and shooters who want less weight without sacrificing durability or reliability. Built from premium materials and finished with a salt bath nitrided coating, this bolt carrier group sheds unnecessary ounces while maintaining full MIL-SPEC strength and the capability to run full-auto fire control groups and modern multi-stage trigger systems. If you're assembling a lightweight rifle for hunting, competition, or tactical use, the Gunner BCG earns its name by combining proven engineering with meticulous manufacturing.

What sets this carrier group apart is the relentless attention to material selection and surface treatment. The bolt itself is forged from 9310 tool steel—stronger than the standard C158—and undergoes full MIL-SPEC heat treatment before magnetic particle inspection to catch any hidden defects. The extractor uses S7 tool steel and receives the same rigorous testing. Every component then gets the QPQ salt bath nitriding process, which hardens the surface, reduces friction, and seals against corrosion far better than chrome or phosphate finishes. This means smoother operation, less fouling buildup, and exceptional longevity in the field.

The engineering details matter too. Bolt lugs are chamfered at 45 degrees to ensure reliable feeding even with hot hand loads and rapid cycling. The carrier is superfinished to minimize resistance and maximize smoothness. Grade 8 fasteners secure the gas key and are fully staked for a lifetime of service. Every assembly that leaves Faxon's facility gets laser-engraved with the Faxon Shield after passing quality inspection—a mark of genuine confidence in the product.

For AR shooters building a lightweight upper or swapping out a heavier carrier, the Gunner BCG offers the kind of thoughtful design and material quality that translates to better performance and fewer surprises downrange.

Key Features

• 9310 tool steel bolt—superior strength compared to standard C158 material
• QPQ salt bath nitriding on all components for enhanced corrosion resistance and reduced friction
• Superfinished carrier for smooth, low-resistance operation
• Full MIL-SPEC heat treatment and magnetic particle inspection on bolt
• 45-degree chamfered bolt lugs for reliable feeding and fast cycling
• Grade 8 fasteners fully staked on gas key for lifetime durability
• Compatible with full-auto and multi-stage trigger systems
• Forward assist serrations present
• Laser-engraved Faxon Shield after quality inspection

Specifications

Frequently Asked Questions

Is this bolt carrier group compatible with full-auto fire control groups?

Yes. The Gunner BCG maintains the full-auto trip sear and is rated for full-auto fire control groups, as well as modern multi-stage trigger systems.

What finish is used on this carrier group?

All components are finished with QPQ salt bath nitriding, which provides superior corrosion resistance, increased surface hardness, and reduced friction compared to standard chrome or phosphate coatings.

How much does this bolt carrier group weigh?

The carrier and gas key weigh 6.32 ounces combined. This is a lightweight design built for shooters looking to reduce overall rifle weight without compromise.

What caliber is this bolt carrier group for?

This is a 5.56 NATO bolt carrier group, compatible with AR-15 platforms and upper receivers chambered in 5.56 or .223 Remington.