Faxon Firearms 300 Blk 10.5'' 1-8 Gunner Contour Bbl W/Pinned Gas Block Nitr

The Faxon Firearms 300 Blk 10.5" 1-8 Gunner Contour barrel with pinned gas block is a complete, ready-to-run solution for 300 Blackout AR builds that demand reliability without the guesswork. This 10.5-inch barrel ships with a pre-drilled, pre-notched low-profile gas block and matching pin already fitted—no calculating bore offsets or hunting for the right hardware. Just install it and shoot. It's built for hunters, close-quarters tactical shooters, and anyone running subsonic loads or suppressed setups who needs a short, handy platform.

Faxon's Gunner profile splits the difference between a heavy Government contour and a featherweight Pencil, giving you durability where it matters while keeping heft down where it doesn't. The result is a rifle that balances faster handling and reduced shooter fatigue against the durability required for serious use. At 1.10 pounds, it won't sacrifice your AR's handling characteristics, and the 1-in-8 twist is optimized for the subsonic and supers that make 300 Blackout worth running. The pinned gas block eliminates a common failure mode—gas block creep—that can degrade reliability or POI stability over strings of fire.

Every Faxon barrel starts as certified 4150 CMV steel, fully stress-relieved and button-rifled for consistent accuracy. This one is finished inside and out in Nitride, a process that hardens the bore and external surfaces while maintaining dimensional stability. Faxon individually headspace-checks each barrel with precision gauges and inspects for magnetic particle defects. The 11-degree target crown and M4 extension ensure compatibility with standard AR-15 upper assemblies and bolts.

Key Features

• Pre-pinned gas block assembly included—gas block and pin installed and ready to go
• Gunner profile balances weight savings with durability for all-day shooting, training, or hunting
• 1-in-8 twist optimized for 300 Blackout subsonic and supersonic loads
• Pinned gas block eliminates creep and POI shift
• Nitride finish on bore and exterior for corrosion resistance and wear durability
• Individually headspace-checked and magnetic particle inspected
• 11-degree target crown for superior accuracy potential
• Manufactured in-house in Cincinnati, Ohio

Specifications

Frequently Asked Questions

What comes in the box with this barrel?

The barrel ships with a low-profile gas block and pin already installed and fitted. The gas block is hand-tightened for safe shipping; you'll tighten it fully and secure the pin when you assemble the upper.

Is this barrel compatible with my standard AR-15 upper receiver?

Yes. It uses an M4 barrel extension and 5/8–24 muzzle threads, both industry standard. It will work with any standard AR-15 upper assembly and bolt carrier group.

Why would I want a pinned gas block?

Pinning your gas block (in addition to set screws) prevents the block from rotating or creeping under recoil, which can degrade reliability and shift your point of aim. This barrel eliminates that assembly step by coming with the block already pinned and drilled.

What is the Gunner profile, and is it right for my build?

Faxon's Gunner profile combines the durability of a Government contour with the weight savings and handling speed of a Pencil profile. It balances shootability and reduced fatigue against the structural strength needed for serious use—hunting, training, or tactical work. At 1.10 pounds, it keeps your rifle nimble without sacrificing longevity.