The Faxon Duty Series 13.9" Big Gunner .308 Win Barrel brings the accuracy and dependability of our renowned Gunner design to the AR-10 platform. Optimized through customer feedback, this updated medium-taper profile provides exceptional balance, reduced weight, and durability suitable for duty or competition.

Machined from 4150 CMV steel and finished inside and out in a durable salt bath nitride treatment, each barrel is stress-relieved, button-rifled, and MPI inspected for guaranteed quality. The Big Gunner profile tapers behind the gas block for stiffness, then lightens forward for faster handling and better balance as a suppressor host or general-purpose carbine barrel.

Compatible with LR-308 / DPMS-pattern receivers, this 13.9" mid-length barrel offers reliability and performance in a compact package ideal for duty, hunting, or competition.

Key Benefits

• Big Gunner Profile: Medium taper behind the gas block for rigidity and reduced weight forward for control.
• 4150 CMV Steel: Mil-Spec material for strength and heat resistance under sustained fire.
• 1:10 Twist Rate: Optimized for a wide range of .308 Win projectiles.
• Salt Bath Nitride Finish: Corrosion-resistant inside and out for long-term durability.
• Mid-Length Gas System: Balanced recoil and smooth cycling for short .308 carbines.
• 5/8x24 Muzzle Threads: Standard for .30 cal suppressors and muzzle devices.
• DPMS-Compatible Extension: Fits standard LR-308 pattern upper receivers.
• Individually MPI & Headspaced: Each barrel is precision-gauged for safe, consistent fitment.

Specifications

Important Product Note

Faxon Firearms Duty Series barrels are designed for hard use and high round count applications. Ensure proper gas system alignment and headspacing when installing on DPMS Gen 1-pattern receivers. Consult a qualified gunsmith for installation if needed. Faxon Firearms is not liable for damage resulting from improper installation or non-compatible parts.

Frequently Asked Questions

Overview: 13.9" Duty Series Big Gunner .308 Win Barrel

The Faxon Duty Series 13.9" Big Gunner .308 Win Barrel offers premium accuracy and rugged reliability in a compact AR-10 format. Made from 4150 CMV steel and finished in salt bath nitride inside and out, it delivers exceptional durability for duty use or competition. Faxon’s Big Gunner profile balances strength, weight, and thermal performance for a true do-everything .308 barrel.

Proudly made in Cincinnati, Ohio, Faxon Firearms barrels are stress-relieved, MPI inspected, and headspaced for safe, precise performance round after round.