Faxon Duty Series 8" Big Gunner 8.6 Blackout 4150 Nitride Pistol Length Barrel

Faxon Duty Series 8″ Big Gunner 8.6 Blackout 4150 Nitride Pistol Length Barrel

The Faxon Firearms 8″ Big Gunner 8.6 Blackout Pistol-Length Barrel is engineered for maximum power in the shortest possible package on the AR-10 platform. Built around the innovative 8.6 Blackout cartridge, this barrel is ideal for subsonic shooting, suppressed builds, or compact tactical configurations that demand precision and terminal energy without unnecessary bulk. For shooters building AR-10 pistols or SBRs, this barrel offers excellent performance in a compact footprint.

Faxon machines this barrel from 4150 CMV steel and applies a QPQ salt bath nitride treatment both inside and out to enhance corrosion resistance and barrel life. The true standout feature is the 1:3 twist rate, specifically designed to stabilize the heavy projectiles commonly associated with 8.6 BLK. This ultra-fast twist ensures that bullets perform as intended, even at subsonic velocities, enabling devastating performance on target even within close-quarters scenarios.

The Big Gunner profile gives you a heavier contour near the chamber and gas block to maintain rigidity and heat resistance, with a tapered front end that keeps weight manageable. The pistol-length gas system ensures reliable cycling, even when running subsonic ammunition suppressed. The barrel includes an oversized .875″ gas block journal and M18x1.5 muzzle threads, making it easy to pair with common suppressor-ready devices or direct-thread cans. A DPMS Gen 1 .308 extension ensures compatibility with standard AR-10 upper receivers.

Each barrel is magnetic particle inspected to guarantee structural integrity, and it’s finished with an 11-degree target crown for consistent muzzle harmonics and enhanced accuracy. At just 8 inches in length, it’s a great choice for building a compact, hard-hitting platform tailored for modern shooting needs.

If you are new to building AR-10 rifles and have any questions about Faxon Firearms 8″ Big Gunner 8.6 Blackout Pistol-Length Barrel, we are always here to help!