The Faxon Firearms Duty .308 Win Barrel is a 13.9-inch Big Gunner Contour bare barrel from FAXON FIREARMS (brand part no. 10A810M139NGQ) chambered in .308 Winchester for large-frame AR rifles. At 13.9 inches, it is sized to reach the legal 16-inch minimum only once paired with a pinned-and-welded or otherwise permanently attached muzzle device, and its 1-in-10 twist rate is the standard stabilization rate for common .308 Winchester bullet weights. The Big Gunner Contour adds mass for heat management, and it carries a nitride finish.

Key Specifications

• It is chambered in .308 Winchester.
• It measures 13.9 inches long.
• It uses a 1-in-10 twist rate, the standard stabilization rate for common .308 Winchester bullet weights.
• It carries Faxon’s Big Gunner Contour profile, adding mass for heat management.
• It has a nitride finish for corrosion resistance.
• It is part of Faxon’s Duty barrel line.

Frequently Asked Questions

Does this barrel make my AR-15 an SBR? No. A barrel sold on its own is not a regulated firearm. Installing this barrel on a complete, already-assembled rifle lower with a shoulder stock requires an approved ATF Form 1 before assembly; building it as a pistol with no stock avoids that requirement entirely.

Why is this barrel 13.9 inches instead of 16? At 13.9 inches it is intended to reach the legal 16-inch rifle minimum once paired with a pinned-and-welded (permanently attached) muzzle device; sold bare, it is not itself a regulated length.

Buy the Faxon Firearms Duty .308 Win 13.9in Big Gunner Contour Barrel Nitride

Order the Faxon Firearms Duty .308 Win 13.9in Big Gunner Contour Barrel Nitride through our rifle parts selection at Schaefer Defense and we will ship it fast, fully insured, from our Lubbock, TX gun shop.