Faxon Duty Series 18" Gunner, 5.56 NATO, Rifle-Length, 4150 QPQ Nitride AR-15 Barrel

(23 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 NATO
  • Barrel Twist: 1:8
  • Barrel Length: 18"
  • Barrel Profile: Gunner
  • Barrel Gas System: Rifle Length
  • 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: 1.58 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:
16" - 18"


  • 5
    Great barrel for 3 Gun

    Posted by DND on Apr 12th 2016

    I've put about 1k rounds down this barrel and it shoots well, 55 gr FMJ, 62 SP, 69 & 77 OTM. My local club shoots to 600y during 2/3 Gun matches, at the end of the stage. Using a 2 MOA red dot, this barrel shoots sub 2 MOA groups at 100y, after a 30 round HOT (magazine dump)! Friends are amazed at how light it feels with a 15" FFT as well. With a properly aligned DPMS JM Comp, the red dot barely moves. Thanks for a quality barrel.

  • 5
    Great for 3-gun competition, very accurate!

    Posted by Steve on Mar 20th 2016

    The accuracy of this barrel is very impressive. The 1:8 twist rate and 18" length have turned out to be the right combination for 3-gun competition. Using 55 gr IMI brand 5.56 M193 FMJ ammo I am hitting the 12" steel at 300 yds with iron sights, while many others with their expensive fancy scopes are missing. I'm not an operator or highly experienced marksman, so I chalk up the accuracy to the barrel. The 18" length is very easy to maneuver, so if you're debating between the 16" or 18" don't be afraid to go with 18".

  • 5
    Lightweight and accurate

    Posted by Unknown on Nov 18th 2015

    This is the perfect barrel for a lightweight 3-gun rifle. The balance of the gun with this barrel is outstanding. Accuracy is good and the 1:8 twist allows for the use of a wide variety of bullet weights.

  • 5
    Lightweight, accurate, and well made.

    Posted by Ryan on Sep 22nd 2015

    Handles American Eagle xm193 well, even the particularly bad batch I purchased recently (corroded cases and one light powder charge that lead to a squib scare). Easily half the weight and group sizes of my old barrel while being softer shooting to boot. I can't be more pleased with the performance of this barrel.

  • 5
    Extreme value

    Posted by Deputy on Jul 10th 2015

    I have nearly 400 rounds of full pressure 5.56 xm193 ammo from federal down the pipe, along with another hundred or so of federal .223 55gr fmj. Very pleased. Recoil is light, weight is ridiculously light, machining is approaching perfection, and all dimensions are in spec. Chamber is true 5.56 NATO and handles full pressure stuff with ease. Buy with confidence!