Faxon Duty Series 13.9" Gunner, 5.56 NATO, Mid-Length, 4150 QPQ Nitride AR-15 Barrel

(4 reviews)
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The Gunner profile is a blend of two of the best performing profiles of all time, Gov't and Pencil. Faxon's Gunner profile combines the durability of the Gov't profile with the weight savings and maneuverability of the Pencil profile. The Gunner profile brings the balance of the rifle back towards the shooter's body, limiting fatigue, and allowing for shooting, training, or hunting all day long.

Faxon Firearms barrels are the pinnacle of value. Manufactured in-house in Cincinnati, Ohio, Faxon barrels are fully stress relieved, air-gauge tested, and 11 degree target crowned to ensure superior accuracy. Quality is imbued into our barrels from the beginning of the manufacturing process.. We start with the best materials, either certified 4150 Mil-Spec steel or 416-R Stainless. From there, each barrel goes through a battery of tests at each operation until finished in Nitride and final inspected. All barrels are individually checked for headspace with precision PTG gauges.

  • Barrel Material: 4150 CMV
  • Barrel Type: Button Rifled 
  • Barrel Caliber: 5.56
  • Barrel Twist: 1:8
  • Barrel Length: 13.9”
  • Barrel Profile:  Gunner
  • Barrel Gas System: Mid
  • Inside Finish: Nitride
  • Outside Finish: Nitride
  • Muzzle Thread: 1/2-28
  • Gas Block Diameter: .625"
  • Gas Block Journal Length: 1.9"
  • Barrel Extension: M4 
  • Weight:  1.26 lbs
  • Magnetic Particle Inspected!
  • 11-degree Target Crown

Barrel Caliber:
5.56 NATO
Barrel Profile:
Barrel Material:
4150 CMV
Rifling Twist Rate:
Muzzle Thread:
Gas Block Diameter:
Gas System Length:
Barrel Length:
Barrel Length Range:
11.5" - 14.5"


  • 5
    13.9” Gunner

    Posted by Fred on Mar 29th 2023

    I pinned and welded a muzzle device to this for my flow through suppressor. So far I’ve put about 300 rounds through the rifle and it has quickly become one of my favorite builds. The length is perfect and the overall length with my K config suppressor attached is just one inch longer than my standard 16” rifles (with just the muzzle device). My wife shot a 0.5” group at 50 yards with 3x magnifier with her first 5 shots. Later that day I shot a 1.7 MOA group with 3x at 100 yards. Not stellar but with 3x and shooting off my bag with no stable platform I’m very happy with that performance. I am likely to build my next rifle with another of these barrels.

  • 5
    13.9" 5.56

    Posted by John McClane on Mar 3rd 2023

    Great quality product, fit prefect in my left-handed stag upper, no blemishes Can not wait to take it to the range This is my 5th Faxon barrel

  • 5

    Posted by nathan schwappach on Mar 2nd 2023

    Purchased to build my wife’s lightweight tactical rifle. I built it with carbine style handguard a. I wasn’t aiming for sub MOA but am extremely pleased with a 1.2” group. Pinned and welded to a Surefire Warcomp came to 16.25! Accurate description.

  • 5
    Gunner Barrel

    Posted by Jordan Blackson on Jan 21st 2023

    Bought this barrel for a gun build for my cousin, wanted something lightweight for a female, but durable that can run a gun all day and be suppressed. And this barrel is it; the taper to pencil after the gas block with a silencer is equivalent to a 16" gov profile. She loves the fact that the gun feels lighter, but it's not lighter it's just balanced better not being end heavy at the muzzle. It's safe to say 13.9" pin & weld gunners will be her barrel for future builds.