Faxon Duty Series 16" Gov't/Socom, 5.56 NATO, Mid-Length, 4150 QPQ Nitride AR-15 Barrel

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(24 reviews)
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Manufactured in-house, these 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 start. 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 by precision custom hardened gauges. 

  • Barrel Material: 4150
  • Barrel Type: Button Rifled 
  • Barrel Caliber: 5.56 NATO
  • Barrel Twist: 1:8
  • Barrel Length: 16"
  • Barrel Profile: Socom
  • Barrel Gas System: Mid Length
  • Inside Finish: Nitride
  • Outside Finish: Nitride
  • Muzzle Thread: 1/2-28 TPI
  • Gas Block Diameter: .750"
  • Gas Block Journal Length: 1.9"
  • Barrel Extension: M4
  • Weight: 1.65 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 Range:
16" - 18"
Barrel Length:


  • 5
    perfect barrel

    Posted by Azheat on Apr 15th 2016

    First glance i could tell it was worth every penny, quality is highend. Will try to buy another barrel, 18" this time , for sure.

  • 5
    Quite Impressed.

    Posted by MJ on Apr 14th 2016

    I sighted it in at 50yds for initial grouping, and with cheap M885 ammo, the holes were almost touching. So I took a shot at 150 yds at my 3" steel target, and it was a hit every time. For the price, it can't be beat!

  • 5
    16" socom

    Posted by Unknown on Apr 5th 2016

    Great barrel, fast shipping

  • 5
    No compromise

    Posted by Tyler on Mar 29th 2016

    I waited until I had a chance to shoot this barrel before reviewing it. I'll start at the beginning... before I ordered a barrel, folks at Faxon were very responsive to all of my inquiries about different products, and availability timelines nothing worse than asking about a product and getting an answer 3 days later, Faxon answered any question I had within minutes, or hours. Shipping was fast, barrel arrived in very nice, protective packaging, finish was flawless. I instantly told a family member about this barrel and they went and bought a 300 blackout from faxon (have not shot that one yet, but everything said above is the same with that barrel). Installation was very easy, I put this barrel on an aero precision enhanced upper... finished the build and finally got to shoot it. Could not have asked for better performance from this barrel, it's very accurate (more than I am). I was also concerned that maybe the gas port would be too big, or my gun would end up being over gassed, or some sort of issue, since this was my first rifle build, but perfect ejection patterns, not a single stoppage. I have to agree with the many customers of Faxon and say that this has to be one of the best quality barrels for much less money. Zero compromises using a faxon barrel.

  • 5
    High quality price is right

    Posted by Derek on Mar 16th 2016

    Very high quality. I would like to see a pre-dimple or pin option for the barrels. The Faxon gas blocks use three set screws spaced differently from other manufacturers.

  • 5
    excellent barrel, reasonable price

    Posted by ibmikey on Mar 15th 2016

    I have built four AR's around this Faxon barrel after the first build provided everything I was attempting to obtain in a light, easy handling and accurate carbine. Most of my shooting is at steel, rocks, dirt clods and cans of every size and shape. The Faxon barrels are beautifully machined and surface prepared with a nitride process resulting in long wear. My first rifle has in excess of 5000 rounds of ammunition with no suggestion of a loss of accuracy. Installed the AR balances well this barrel aiding in quick movement on targets.

  • 5

    Posted by DJ on Feb 22nd 2016

    Great value. Great quality!

  • 5
    16" 5.56 SOCOM

    Posted by Bill on Feb 20th 2016

    Another quality barrel from Faxon. Wish you guys would get into manufacturing 6.8 SPC barrels.

  • 5
    best barrel!

    Posted by Unknown on Feb 19th 2016

    If Faxon keeps making these barrels the way they are, and same price range then all my builds will bee with this barrel no question. Two thumbs way up!!