Faxon Duty Series 16" Gunner, 5.56 NATO, Mid-Length, 4150 QPQ Nitride AR-15 Barrel

(24 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: 16”
  • 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:  1.37  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
    Faxon Quality

    Posted by NateH on Oct 6th 2023

    Typical high quality you can expect of Faxon. Cant go wrong

  • 5
    Good barrel

    Posted by Charlie on Jul 8th 2022

    I purchased this on sale and am very pleased with it. It’s good quality and fits perfectly with my faxon bolt carrier group I also purchased for my ar-15 build. My only negative with it is that it does not come with any dimples to attach a gas block to it.

  • 4
    Faxon 5.56 barrel, 16"

    Posted by Gary Ruisinger on May 3rd 2022

    Quality barrel like the other Faxon barrels I have bought. Took off one star because the barrel did not have a starter dimple for the gas block

  • 5
    customers love them!

    Posted by TurboArmory on Apr 21st 2022

    Good job I’m glad I’m a Faxon dealer.

  • 5
    Best barrel ever

    Posted by Kyle Colborn on Feb 17th 2022

    Consistently outshot all my buddies at the range with this barrel. They all spent big money on their pre built Daniel defense ar. Did some homework built my own slapped this baby on there and been loving it everyday since.

  • 5
    16 inch gunner barrel and BCG Black Friday special

    Posted by Charles Beal on Dec 13th 2021

    Purchased on black Friday with BCG. WHAT A DEAL for 199.00. Same great quality and accuracy as my other Faxon barrels and great value !!! 5 stars

  • 5
    Just buy it! You won't be disappointed. Faxon... Nuff said! If it is made by Faxon, you know you're getting quality at a fair price. B E A utiful barrel! These guys know what they're doing. Put one in your build, take it out and shoot the snot out if

    Posted by Jimmy Sweatt on Jul 26th 2017

    Faxon barrels... Nuff said!

  • 5
    16" Gunner in 5.56 NATO

    Posted by Unknown on Jul 4th 2017

    Fast delivery. Impecable outside finish. First session at the range gave me 2" groupings at 100 yrds. using 62gr green tips. Super light and a better choice than the pencil profile.

  • 5
    Outstanding quality!!! Even better price!

    Posted by Miles Beaver on May 12th 2017

    Had not really heard of Faxon until recently and I should feel ashamed. I recently watched some Q&A vids with a favorite youtube channel InRange, they had a Faxon rep that blew my mind with info. I just had to try a barrel from Faxon and was surprised by all the other quality stuff they seemed to make. I cannot yet comment on the accuracy of my barrel but the machining and finish are top notch. The gunner is a gorgeous barrel to say the least, I cannot say enough that the machining is perfect. Even the laser engraved Faxon logo is very nice. The best part is they almost seem to hit the perfect price point for me. I didn't want a cheap barrel thats only accurate when it's ice cold but I can't justify spending 350-400 for a quality barrel. Faxon hit my heart and wallet just right. Needless to say, as funds become available I will be buying most parts for my upper from Faxon and will keep you all updated with the results!!! Love the barrel just buy it!