The Faxon Firearms Duty Series AR-15 Barrel (brand part number 15A58M125NGQ) is a 12.5-inch 5.56 NATO barrel cut to Faxon’s Gunner profile, balancing a lighter forward swing weight with enough steel to hold up under sustained fire. Finished in black matte and cut with a 1:8 twist, it stabilizes the full range of common 5.56/.223 bullet weights and runs a mid-length gas system for softer, more reliable cycling than a comparable carbine-length barrel. The muzzle comes threaded to accept standard-pattern muzzle devices, and Faxon finishes the crown at 11 degrees to protect accuracy from bumps and knocks.

Key Specifications

• Chambered in 5.56 NATO/.223 Remington.
• Cut to 12.5 inches in barrel length.
• Rifled with a 1:8 twist rate.
• Machined to Faxon’s Gunner profile.
• Finished in black matte.
• Runs a mid-length gas system for smoother cycling.
• Sized for a 0.625-inch gas block.
• Muzzle is threaded to accept standard muzzle devices.
• Finished with an 11-degree target crown for accuracy.
• Ships without iron sights, so pair it with the optic of your choice.

Frequently Asked Questions

What twist rate does this barrel use? 1:8, which stabilizes the full range of common 5.56/.223 bullet weights.

What gas system does it run? A mid-length gas system sized for a 0.625-inch gas block.

Is the muzzle threaded? Yes, it’s threaded to accept standard-pattern muzzle devices.

Buy the Faxon Firearms 12.5-Inch 5.56 NATO Barrel

Build a lighter, faster-handling AR-15 without giving up accuracy or reliability. Order it from our Faxon Firearms lineup, part of our AR-15 barrels selection, at our Lubbock, Texas gun shop for fast, direct shipping.