Faxon Duty Series 16", Gunner, 300 BLK, Carbine-Length, 4150 QPQ Nitride AR-15 Barrel

(8 reviews)
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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: 16”
  • Barrel Profile:  Gunner
  • Barrel Gas System: Carbine
  • Inside Finish: Nitride
  • Outside Finish: Nitride
  • Muzzle Thread:5/8x24 
  • Gas Block Diameter: .750" 
  • Gas Block Journal Length: 1.9"
  • Barrel Extension: M4 
  • Weight:  1.48  lbs
  • Magnetic Particle Inspected
  • 11-degree Target Crown

Barrel Material:
4150 CMV
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:
1.48 lbs
Crown Type:
Recessed 11-degree Target Crown
Barrel Length Range:
16" - 18"


  • 5
    Great barrel

    Posted by James Davis on Mar 31st 2023

    Perfect solution for the current political shenanigans. I do with Faxon offered a version with a mid-length gas system.

  • 5
    16" GUNNER, 300 BLK, CARBINE-LENGTH, 4150 QPQ, AR-15

    Posted by Mark Nichols on Sep 22nd 2022

    This is the third barrel of yours I have of the Gunner profile. I appreciate the accuracy and weight, quick handling, transition target to target it provides. The only improvement that you could add is a dimple for the gas block, other than that it's hard to improve on perfection.

  • 5
    16in Gunner Barrel

    Posted by Richard Miller on Mar 31st 2022

    Great barrel with a great price point. My 2nd. Happy

  • 5
    16" 300blk gunner

    Posted by Greg Lamb on Jan 9th 2022

    So far only put a few rds through it to test function with different loads. Looks good, so far shoots good with standard loads, not so much with sub-sonic loads. Wish Faxon made the same barrel with Pistol length gas! So far I'm happy with it. LOTS lighter than a medium weight barrel!

  • 5
    16" GUNNER, 300 BLK, Carbine-Length

    Posted by John Mullikin on Sep 26th 2017

    Purchased with bolt carrier group, very pleased, excellent quality

  • 5
    300 blackout 16" gunner

    Posted by Lenny on Aug 30th 2017

    Much lighter than the heavy barrel i swapped. It makes my 300 blackout rifle much handier because of the lighter weight. Faxon shipped my barrel extremely fast! I have had it sitting ready to install for several weeks due to time constraints. I cleaned the bore and chamber prior to firing . the chamber seems a little rough per scratched casings. I will dress up the chamber a little more. Barrel seems accurate, though i didn't shoot groups. I just loaded up 5 rounds and popped a sandbar in my pond as it was raining out. Am satified with the accuracy at this time. Will upd8 review when i have a little more time.c

  • 5

    Posted by John on Jul 3rd 2017

    Looks good, no defects or blemishes. Shipping was prompt. Barrel seems to be of high quality. I have not installed or tested it yet but still in the build process. It did fit well with my upper though during test assembly.

  • 5
    Great Barrel

    Posted by LR on May 16th 2017

    This is the first barrel I have purchased from Faxon. The barrel itself is very accurate. I was only able to get it sighted in but I would expect even better groups once broken in. I haven't tested the barrel for best group size yet but i had consistant 1" groups for sighting in purposes using a less than ideal rest. Even with that the barrel only took 8 rounds to sight in and punch center. The fit and finish were very good, although the gas port was canted to the right. I'm not sure if that is usual for Faxon barrels or not. Lastly, I had an issue initially. I ordered a .300 Blk barrel but I received a 7.62x39 Russian instead. I contacted customer service the same day and they sent the correct barrel right away. My only complaint is the second barrel was shipped with standard shipping. I would have liked expedited shipping on the second barrel due to the factory sending the incorrect barrel to begin with. At least Faxon paid for the return shipping . So far I'm pleased with the barrel itself, and only expect better results. I will consider another Faxon barrel in the future for another build