Faxon 5.56 NATO 20″ Gunner Barrel

Faxon 5.56 NATO 20″ Gunner Barrel


20″ Gunner, 5.56 NATO, Rifle-Length, 4150 QPQ
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Availability: In stock SKU: 15A58R20NGQ

Gas Tubes

Gas tubes by Aero Precision. Includes roll pin.

Gas Blocks

Low profile gas blocks.

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Faxon 5.56 NATO 20″ Gunner Barrel

Faxon 5.56  NATO 20″ Gunner, fully stress relieved, air-gauged, and 11 degree target crowned to ensure superior accuracy.

Manufactured 100% in-house from gun-barrel-quality bar-stock, the Faxon 5.56 NATO 20″ Gunner Barrel starts with 4150 Chrome Moly Vanadium Mil-Spec steel. From there, the barrel goes through a battery of tests at each operation until finished in Nitride and final inspected. This beautiful 5.56 NATO 20″ Gunner barrel is individually checked for headspace by precision custom hardened gauges.

Just what is the Gunner profile?

The Gunner profile is a blend of two of the best performing profiles of all time, Government, and Pencil.

Proving every once and awhile, the Government can do something right, the Gunner profile from extension to gas block mimics that well-known taper. Innovation then takes over and the Gunner moves to a .625″ gas block journal and our famed pencil profile out front.

Removing weight from the front of the barrel ensures maximum versatility and keeps material to the rear to maximize heat resistance and mitigate whip.


Product Specifications

  • Manufacturer: Faxon Firearms
  • Part #: 15A58R20NGQ
  • UPC: 816341020214
  • Barrel Material: 4150 Certified Gun Barrel Quality Steel
  • Barrel Type: Button Rifled
  • Caliber: 5.56 NATO
  • Twist: 1:8
  • Length: 20”
  • Profile: Gunner
  • Gas System: Rifle
  • Inside Finish: QPQ Nitride
  • Outside Finish: QPQ Nitride
  • Muzzle Thread: 1/2-28 TPI (Threads Per Inch)
  • Gas Block Diameter: .625″
  • Gas Port Diameter: .093″
  • Gas Block Journal Length: 1.9″
  • Barrel Extension: M4
  • Weight: 1.53 lbs
  • Magnetic Particle Inspected!
  • 11-degree Target Crown
  • MSRP: $199.00


Arm or Ally is a stocking dealer for all Faxon Firearms, Ballistic Advantage, Rosco Manufacturing, Aero Precision, Toolcraft, Elftmann Tactical, HIPERFIRE and more. See our growing inventory of AR Parts and Reloading Components.

Additional information

Weight 26 oz
Dimensions 18 x 2 x 2 in

QPQ Nitride


5.56 NATO




4150 Chrome Moly Vanadium


Barrel, Upper Receiver Parts



Muzzle Thread

1/2 x 28

Gas Block Diameter




Gas System







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