Faxon Duty Series 18" Gov't/Socom, 5.56 NATO, Rifle-Length, 4150 QPQ Nitride AR-15 Barrel

(5 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 CMV
  • Barrel Type: Button Rifled 
  • Barrel Caliber: 5.56 NATO
  • Barrel Twist: 1:8
  • Barrel Length: 18"
  • Barrel Profile: Gov't/Socom
  • Barrel Gas System: Rifle Length
  • Inside Finish: Nitride
  • Outside Finish: Nitride
  • Muzzle Thread: 1/2-28
  • Gas Block Diameter: .750"
  • Gas Block Journal Length: 1.9"
  • Barrel Extension: M4
  • Weight: 1.86 lbs
  • Magnetic Particle Inspected!
  • 11-degree Target Crown

Barrel Material:
Barrel Type:
Button Rifled
Barrel Caliber:
5.56 NATO
Barrel Twist:
Barrel Length:
Barrel Profile:
Barrel Gas System:
Inside Finish:
Salt Bath Nitride
Outside Finish:
Salt Bath Nitride
Muzzle Thread:
Gas Block Diameter:
Gas Block Journal Length:
Barrel Extension:
1.86 lbs
Crown Type:
Recessed 11-degree Target Crown


  • 4
    Well weighted

    Posted by BCB82 on Aug 20th 2016

    Bought this barrel as a cost effective, but still quality, mid-priced barrel, based upon multiple reviews from various sources and the fact it was available at time of purhase. Cons: First trial run of 30 rounds of 5.56 brass M193-had a failure to feed. Measured gas port was .086". Drilled port to .093" and had No failures with brass, but still did not have enough gas to feed lower powered wolf ammo. Drill port to .10". Pros: Was pretty inherently accurate using multiple types of 55gr and 62gr 5.56 as well as .223 ammo from different Mfr's. Even though was too low powered to feed wolf it still grouped quite Better than my expectations. Having done more research, my barrel was one of many with too small of diameter gas port issues. Gas port was measured using high grade Fowler micrometer. I am a professional diesel mechanic and my knowledge of precicion measuring instruments and their use is a daily requirement for me. **FAXON NOTE - The gas ports were expanded to .092" effective August of 2015. If anyone has an issue, ever, please contact us!

  • 5
    Top of the line Barrel

    Posted by Ralph Bishop on Mar 8th 2016

    I bought this barrel , because of how excellent the quality was on the first barrel that I bought. Faxon makes the best barrel on the market. This is my second build and my friends are already asking where to buy all of their parts, Faxon will be hearing from them.

  • 5
    Socom 18"

    Posted by GBart on Mar 1st 2016

    I have purchased barrels from other manufacturers before, none even come close to this quality. this barrel could easily sell for 100$ more and still be a value!!

  • 5

    Posted by Unknown on Jan 7th 2016

    Bought this barrel for a high end build. My first 18", rifle gas build. It has all the specs I look for when barrel shopping and at an affordable price, I was not disappointed. The fit and finish is of the highest quality. Zero in at 50 yards and rings a 4" gong all day long at 112 yards, that's as far as we can shoot at our home range. I know it will do a lot better with a better shooter than I am. Faxon will be my first choice for now on!!!

  • 5
    Purchased the 18" 556 socom

    Posted by kyle on Dec 4th 2015

    Haven't had the chance to shoot it yet but the fit and finish is perfect. Hard to beat price for such a nice barrel. I also bought the handguard which fits great and really looks amazing.