Faxon Duty Series 10.5", Gunner, 300 BLK, Pistol-Length, 4150 QPQ Nitride AR-15 Barrel

(5 reviews)
Current Stock:

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: 300 BLK
  • Barrel Twist: 1:8
  • Barrel Length: 10.5”
  • Barrel Profile:  GUNNER
  • Barrel Gas System: Pistol
  • Inside Finish: Nitride
  • Outside Finish: Nitride
  • Muzzle Thread: 5/8x24 
  • Gas Block Diameter: .750" 
  • Gas Block Journal Length: 1.9"
  • Barrel Extension: M4 
  • Weight:  1.10 lbs
  • Magnetic Particle Inspected
  • 11-degree Target Crown

Barrel Material:
Barrel Type:
Button Rifled
Barrel Caliber:
300 BLK
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:
Barrel Weight:
1.10 lbs
Crown Type:
Recessed 11-degree Target Crown
Barrel Length Range:
8" - 10.5"


  • 5
    10.5" 300 Blk-out

    Posted by John McClane on Mar 3rd 2023

    Great quality product, fit prefect in my left-handed stag upper, no blemishes Can not wait to take it to the range

  • 5
    10 1/2 gunner barrel

    Posted by Leroy Bertram on Dec 17th 2019

    Nice barrel just like all Faxon products saving money for Faxon bcg

  • 5
    10.5” Gunner, 300BLK Barrel

    Posted by Ron on Apr 11th 2019

    Fit and finish is excellant. Chamber size was spot on. Accuracy is better than expected. Pistol length gas works well with super and sub-sonic. Adjustable gas block not needed.

  • 5
    10.5" Gunner/300 BLK

    Posted by ERIC on Mar 11th 2018

    Fantastic barrel. Lightweight and accurate. The gas port size is perfect for any combination of sub/supersonic loads, suppressed/unsuppressed.

  • 5
    Light and a tack driver

    Posted by Owen Stevens on Jun 30th 2017

    Replaced my 10.5 300BLK with the light weight gunner. Balance is much better with this barrel and it is super accurate. I put multiple shots it the same hole. Very happy with this purchase.