The Faxon Firearms Duty Series Gunner Profile 13.9" Barrel in 5.56 NATO delivers a precise blend of the two most time-tested AR-15 barrel contours: the Government and the Pencil. By merging the Government profile's durability behind the gas block with the Pencil profile's weight savings toward the muzzle, Faxon's Gunner design shifts the rifle's center of gravity rearward - reducing front-end fatigue and enhancing control during extended sessions of shooting, training, or hunting. At 13.9", this barrel is purpose-built for pin-and-weld configurations that achieve a legal 16" overall length once a muzzle device is permanently attached. Manufactured in-house in Cincinnati, Ohio, each barrel starts as certified 4150 CMV Mil-Spec steel, button-rifled with a 1:8 twist, and then fully stress relieved, air-gauge tested, and magnetic particle inspected before receiving a durable black nitride finish applied both inside and out for exceptional corrosion and wear resistance. An 11-degree target crown and precision PTG headspace gauging round out the quality process, ensuring consistent, reliable accuracy shot after shot.
Product Highlights
- Hybrid Gunner Contour: Combines Government profile durability with Pencil profile weight savings for a fast-handling, fatigue-reducing balance point ideal for duty, competition, and recreational AR-15 builds.
- Pin-and-Weld Ready at 13.9": Designed for permanent muzzle device attachment to meet the 16" legal minimum for non-National Firearms Act rifles, making this a versatile choice for compliant carbine builds.
- Mid-Length Gas System: Provides a smoother, softer recoil impulse and extended gas dwell time compared to carbine-length systems, improving reliability for both suppressed and unsuppressed setups.
- 4150 CMV Steel with Black Nitride Finish: Button-rifled from certified 4150 Chrome Moly Vanadium steel and treated with a salt bath nitride finish inside and out, delivering superior hardness, corrosion resistance, and long-term durability without chrome lining.
- Rigorous Quality Control: Every barrel is fully stress relieved, air-gauge tested, magnetic particle inspected, and individually checked for headspace with precision PTG gauges, then finished with an 11-degree target crown for superior accuracy.
Specs
- Brand: FAXON FIREARMS
- Series: Duty Series
- Model / Profile: Gunner (Government / Pencil blend)
- Caliber: 5.56 NATO
- Barrel Length: 13.9"
- Gas System: Mid-Length
- Gas Block Diameter: .625"
- Gas Block Journal Length: 1.9"
- Material: 4150 CMV (Chrome Moly Vanadium)
- Barrel Type: Button Rifled
- Twist Rate: 1:8
- Finish: Black Nitride (inside and out)
- Muzzle Thread: 1/2-28 TPI
- Barrel Extension: M4
- Crown: 11-Degree Target Crown
- Firearm Fit: AR-15
- Weight: 1.26 lbs
- Country of Manufacture: USA (Cincinnati, Ohio)
- MPN: 15A58M139NGQ
- UPC: 816341026568
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