Faxon Firearms Duty Series 15A58R18NGQ 5.56 18" Gunner Nitride Rifle

The Faxon Firearms Duty Series 5.56 18" Gunner Nitride rifle barrel brings a thoughtfully engineered profile to your AR build—one that balances weight savings with thermal management and rigidity. The signature Gunner profile maintains a standard government diameter from the extension to the gas block, then transitions to a pencil profile forward, deliberately shedding weight where it matters least while preserving steel at the rear of the bore. This philosophy keeps your rifle handling faster without sacrificing heat capacity or introducing barrel whip during sustained fire or long-range strings.

Built in-house by Faxon from start to finish, this barrel arrives stress-relieved and air-gauge tested to tight tolerances. The 11-degree target crown promotes consistent accuracy, and every barrel is individually headspaced with precision custom-hardened gauges before Nitride finishing. You're looking at a barrel that's passed multiple inspection points across manufacturing—a level of oversight that shows in real-world performance on the range or in the field.

The 1:8 twist handles the full spectrum of 5.56 loads and bullet weights, making it a practical choice for hunting, competition, or general-purpose shooting. At 18 inches, this mid-length barrel delivers a balance of velocity and portability, and the Nitride treatment adds corrosion resistance and durability without the brittleness of older hard-chrome plating. If you're replacing a worn barrel or building a rifle that demands precision and reliability, the Faxon Gunner is engineered to deliver.

Key Features

• Gunner profile design: government contour to gas block, pencil profile forward for optimized weight distribution and heat management
• 4150 CMV steel construction, fully stress-relieved for durability
• Button rifled with 1:8 twist, suitable for a wide range of 5.56 ammunition
• 11-degree target crown for improved accuracy
• Nitride finish for corrosion resistance and wear protection
• Individual headspace verification on each barrel
• 100% in-house manufacturing and quality control

Specifications

Frequently Asked Questions

What ammunition does the 1:8 twist stabilize?

The 1:8 twist is a versatile all-rounder for 5.56, stable across standard loads from lighter 55-grain bullets to heavier 77-grain match and hunting rounds. This makes it practical whether you're shooting target ammo, hunting loads, or military surplus.

How does the Gunner profile differ from a standard government profile barrel?

The Gunner profile uses a government contour from the extension back to the gas block, then tapers to a thinner pencil profile from the gas block to the muzzle. This keeps weight forward-of-gas-block minimal while retaining steel where it resists heat and vibration—a design that reduces barrel whip without sacrificing heat capacity.

Is individual headspace checking included?

Yes. Each Faxon Gunner barrel is personally headspaced with precision custom-hardened gauges as part of the final inspection process before it ships.

What finish does Nitride provide over hard-chrome?

Nitride adds excellent corrosion resistance and wear protection while avoiding the brittleness and potential accuracy loss some shooters associate with older hard-chrome plating. It's more durable than plain steel and gentler on precision rifling.