Faxon Firearms Gunner Duty Series 5.56 Nato 13.9" Black Nitride 4150 Cmv

The Faxon Firearms Gunner Duty Series 5.56 NATO 13.9" barrel splits the difference between two proven designs: it pairs the ruggedness of a government profile with the weight savings and quick handling of a pencil profile. The result is a mid-weight barrel that shifts your rifle's balance closer to your body, cutting fatigue during long days of shooting, training, or hunting. Built in-house in Cincinnati, Ohio from certified 4150 CMV steel, this barrel goes through full stress relief, air-gauge testing, and individual headspace verification—the kind of quality control that shows up downrange as consistent accuracy.

Every Faxon barrel starts with premium materials and doesn't skip a step. This one is button-rifled with a 1:18 twist, salt-bath nitrided inside and out for corrosion resistance and durability, and topped with an 11-degree target crown to support precision. The 1/2x28 muzzle threading and M4 barrel extension give you standard AR platform compatibility, so this drop-in fits your existing receiver and handguard setup without surprises.

Whether you're building a reliable duty rifle, setting up a repeatable training platform, or putting together a practical hunting setup, the Gunner profile delivers the balance (literally and figuratively) that keeps you comfortable and effective all day. The quality is baked in from raw material through final inspection—no corner-cutting, just a straightforward, dependable barrel that does the job.

Key Features

• Gunner profile: balanced weight and durability for reduced fatigue and improved handling
• 4150 CMV steel, fully stress relieved and air-gauge tested for consistency
• Button rifled with 1:18 twist for 5.56 NATO
• Salt-bath nitride finish (inside and out) for corrosion and wear resistance
• 11-degree target crown for superior accuracy potential
• Individual headspace verification with precision PTG gauges
• 1/2x28 muzzle threads and M4 extension for standard AR-15 compatibility
• Manufactured in-house in Cincinnati, Ohio

Specifications

Frequently Asked Questions

Will this barrel work on my standard AR-15?

Yes. The M4 barrel extension and 1/2x28 muzzle threads are the industry standard for most modern AR-15 builds and upper receivers. It's a straightforward drop-in fit.

What makes the Gunner profile different from other barrel profiles?

The Gunner profile blends the durability and stiffness of a government-profile barrel with the lighter weight and faster handling of a pencil profile. The result is a mid-weight barrel that reduces shooter fatigue while maintaining the structural integrity you need for reliable performance throughout a long day.

How is this barrel tested before it ships?

Faxon barrels undergo full stress relief, air-gauge testing, and individual headspace verification using precision PTG gauges. Each barrel is inspected at multiple points during manufacturing and again after the nitride finish is applied. No barrel ships without passing that gauntlet.

Is this barrel suitable for hunting?

Yes. The balanced profile and 1:18 twist with an 11-degree target crown support the kind of accuracy and reliability hunters expect. The reduced weight also makes it a practical choice for a day afield.