Faxon Firearms Big Gunner 8.6 Blackout 16-inch Barrel – AR-10

The Faxon Firearms Big Gunner Barrel (brand part no. 10A863C16NGQ) is a 16-inch AR-10 pattern barrel chambered in 8.6 Blackout. Faxon starts with 4150 mil-spec steel and runs every barrel through a battery of tests at each machining step, then finishes it in salt wash nitride inside and out before individually gauging each bore for correct headspace. The Big Gunner profile pairs button rifling with a carbine-length gas system, an M18x1.5 threaded muzzle with a tapered shoulder, and an 11-degree target crown for a crisp, accurate muzzle. A 1.9-inch gas block journal keeps low-profile gas blocks seated correctly. Built by FAXON FIREARMS, this barrel is tuned for the 8.6 Blackout cartridge’s heavy-bullet, subsonic-friendly performance.

Key Specifications

• Chambered in 8.6 Blackout.
• Barrel length measures 16 inches.
• Rifled with a 1 in 3 inch twist to stabilize heavy 8.6 Blackout bullets.
• Machined from 4150 mil-spec steel.
• Finished in salt wash nitride inside and out.
• Uses button rifling for consistent bore dimensions.
• Built with a Big Gunner profile and carbine-length gas system.
• Threaded M18x1.5 with a tapered shoulder.
• Features an 11-degree target crown.
• Gas block journal measures 1.9 inches.

Frequently Asked Questions

What twist rate does this barrel use? It uses a fast 1 in 3 inch twist, needed to stabilize the heavy bullets used in 8.6 Blackout.

What gas system does this barrel run? It uses a carbine-length gas system with a 1.9-inch gas block journal.

What platform is this barrel built for? It is built for the AR-10 pattern platform, threaded M18x1.5 at the muzzle.

Buy the Faxon Firearms Big Gunner 8.6 Blackout 16-inch Barrel – AR-10

Order this Faxon Big Gunner barrel from FAXON FIREARMS through our AR10 barrels selection, shipped fast from our Lubbock, Texas gun shop.