Faxon Duty Series 20", Gunner Profile, 350 Legend, Carbine Gas, 4150, Nitride AR-15 Barrel

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(4 reviews)
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Faxon Firearms is expanding the ever-popular Gunner line of barrels to include the new 350 Legend straight wall cartridge. 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: 350 Legend SAAMI
  • Barrel Twist: 1:16
  • Barrel Length: 20”
  • Barrel Profile:  Gunner
  • Barrel Gas System: Carbine
  • Inside Finish: Nitride
  • Outside Finish: Nitride
  • Muzzle Thread: 1/2x28 TPI
  • Gas Block Diameter: .750" 
  • Gas Block Journal Length: 1.9"
  • Barrel Extension: Big Bore
  • Weight:  1.61  lbs
  • Magnetic Particle Inspected
  • 11-degree Target Crown
Barrel Material:
4150 CMV
Barrel Type:
Button Rifled
Barrel Caliber:
350 Legend
Barrel Length:
Barrel Twist:
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:
Big Bore
Barrel Weight:
1.61 lbs
Crown Type:
Recessed 11-degree Target Crown
Barrel Length Range:
20" - 24"


  • 5

    Posted by Awesome Barrel!! on Sep 5th 2023

    I have gone through almost every brand there is as a Professional Gunsmith when it comes to AR barrels. So When I pick one for my personal firearms it has to meet certain criteria. Meanwhile FAXON does that and Doesn't break the bank at the same time. That is why I own over 12 of their barrels for my own use.

  • 5
    350 Legend 20" barrel - follow up

    Posted by Dane Weaver on Mar 19th 2022

    Follow up on my first review. Shot the Faxon 20" 350 legend barrel with aero XL upper and Faxon 5.56 BCG and the rounds fed perfectly. Only complaints are the 16" and 20" 350 legend barrels get sold out fast.

  • 5
    350 Legend 20" barrel

    Posted by Dane on Feb 25th 2022

    Shipping was fast and I am suprised how light this 20" barrel is. I wanted a 350 legend 20" barrel for hunting in Ohio that allows only straight wall cartridges. I have matched the barrel with Aero XL upper receiver and fit wasn't tight but it wasn't loose either. Haven't shot a round through the barrel yet so I am not sure if I will have feeding issues but I have noticed on my other 350 Legend rifle that Lancer 350 Legend magazines improved feed performance as the lip is cut lower on the magazine.

  • 5
    Right Length & Profile for Hunting & Recreational Shooting

    Posted by John Habbinga on Dec 31st 2021

    I wanted the 20" barrel to keep the velocity up on the the 350 Legend and to match the ballistics printed on the cartridge boxes. I was able to sight-in at 100 yards quickly and keep groups around 1 1/2". The barrel profile keeps the gun light. I have experienced feeding issues common to this cartridge. I think it would help to use this barrel on a receiver that doesn't have feed ramps, but I'm having a hard time finding one. Otherwise I'm very happy with this barrel.