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
    Awesome barrel

    Posted by DS on Nov 29th 2023

    Accurate, light, and slick. Top notch machine work and the QPQ coating is extremely well done. Slides into an upper like butter. Chambers and functions with everything I have thrown at it without a hiccup, heavy or light, hot imi ss109 to wolf 223. It's dropping M193 within spec at 100. It's not a match grade barrel but it's not far off with match ammo. It's way more than it should be for the price and duty capable all day long. I'm extremely satisfied.

  • 5

    Posted by DeadRed Rifle Company on Aug 1st 2022

    Excellent quality. Wouldn't expect anything less from Faxon!

  • 5
    Socom barrel

    Posted by Douglas on Sep 23rd 2018

    Fantastic product. My 5th one. That's how much I like them.

  • 5
    16" govt/socom 556 barrel

    Posted by Luis on Aug 13th 2017

    Wow, bought this for my built, im impressed, heard so much about aboit faxon products. Great quality, I'm definitely buying more faxon barrels.

  • 5
    great barrel

    Posted by Unknown on Dec 7th 2016

    This barrel is a good quality barrel. I originally purchased this in July, but later had to return mine due to it not having correct feed ramps. Faxon payed for return shipping and got me a brand new barrel fast. I did not put this in the review to deter anyone from buying this barrel. I just noted it since it was what happend. Every manufacturer has an occasional issue that does not get caught. Once I installed and zeroed the barrel I was happy with its performance. I havent got a chance to shoot past 50 yards, but I expect this barrel is easily a sub moa barrel with the right ammo. I would not hesitate to purchase again

  • 5
    Sub MOA

    Posted by Mike Marine on Nov 9th 2016

    This is a spectacular barrel irrespective of price. After a 100 round break-in period in accordance with Faxon procedures, the rifle easily gave me sub-MOA results with decent handloads (68gr Hornady BTHP over 24gr of Varget, My next build will definitely include a Faxon barrel!

  • 5
    Great quality barrel

    Posted by Unknown on Aug 19th 2016

    This was my second barrel from Faxon Firearms and I am pleased with it. It is accurate and well made. I would definatly look into these barrels if buildin an ar-15 because they are quality made and very affordable

  • 5
    great deal!

    Posted by Chris Marcoe on Aug 15th 2016

    I haven't got to shoot many rounds through this barrel yet but while trying to sight in my scope I was getting many clover leaf holes at 100 yards with cheap perfecta ammo! I was very impressed with the quality of this barrel and if I was to build another upper wouldn't hesitate to buy from Faxon again! So happy I went with this barrel and anyone else would be too!

  • 5
    Very Nice!

    Posted by Matt on Jun 17th 2016

    I also put this barrel on a customers build, and using PMC Bronze 55gr ammo and came in under MOA. Very good deal on this barrel!