This Faxon Firearms AR-15 barrel (Faxon part number 15B338A8P125NGQ-5R-NP3) is chambered in .338 ARC and built in the brand’s Gunner profile, finished in black matte and measuring 12.5 inches. It runs a pistol-length gas port sized for a .750 gas block and a threaded muzzle, with an 11-degree target crown to help ensure accuracy. The 5R rifling at a 1:8 twist rate is matched to .338 ARC bullet weights, and the barrel ships without sights, ready to build into a compact AR-15 upper.

Key Specifications

• Chambered in .338 ARC.
• Measures 12.5 inches in length.
• Finished in black matte.
• Rifled with 5R rifling at a 1:8 twist rate.
• Runs a pistol-length gas port.
• Sized for a .750 gas block.
• Features an 11-degree target crown for accuracy.
• Threaded muzzle for a suppressor or muzzle device.
• Ships without sights.

Frequently Asked Questions

What caliber is this barrel chambered in? .338 ARC.

What gas system does it use? A pistol-length gas port sized for a .750 gas block.

Is the muzzle threaded? Yes, ready for a suppressor or muzzle device.

Buy the Faxon AR-15 Barrel, .338 ARC, 12.5in Gunner

Build a compact, accurate .338 ARC upper with a proven Gunner-profile barrel. Order this Faxon Firearms barrel from our AR15 barrels lineup, shipped fast from our Lubbock, Texas gun shop.