Faxon 10.5" Pencil, 5.56 NATO, Carbine-Length, 4150, Nitride w/ Pinned Gas Block AR-15 Barrel

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If you're looking for a more robust mounting method for your gas block... look no further. Pinning your gas block, in addition to the use of set screws, gives the user the extra piece of mind that your gas block won't shift or loosen while firing.

We took some of our most popular barrel models and took the biggest headache out of pinning your gas block by pre-notching the gas block journal and drilling corresponding holes in the included low profile gas block.
Each Pinned Gas Block Barrel comes with the pin, as well as a gas block. Gas blocks are hand-tightened to the barrel for shipping.

Faxon Firearms barrels are the pinnacle of value. Manufactured in-house from cradle-to-grave, 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
  • Barrel Twist: 1:8
  • Barrel Length: 10.5"
  • Barrel Profile:  Pencil
  • Barrel Gas System: Carbine
  • Inside Finish: Nitride
  • Outside Finish: Nitride
  • Muzzle Thread: 1/2-28
  • Gas Block Diameter: .625" 
  • Gas Block Journal Length: 1.1"
  • Barrel Extension: M4 
  • Weight:  .9 lbs
  • Magnetic Particle Inspected
  • 11-degree Target Crown

Barrel Caliber:
5.56 NATO
Barrel Profile:
Barrel Material:
4150 CMV
Rifling Twist Rate:
Muzzle Thread:
Gas Block Diameter:
Gas System Length:
Barrel Length:
Barrel Length Range:
8" - 10.5"


  • 5

    Posted by Bryan Archer on Feb 25th 2023

    I purchased one of these barrels a few years ago for a lightweight AR pistol build I was attempting. I couldn't have been happier with the results. Completed I had a gun that is weighed in just under 6lbs Making it wieldy and extremely accurate. I credit the barrel for it's performance.

  • 5
    Lightweight and Perfect

    Posted by Turbo Armory on Nov 26th 2022

    10.5” is your Ultimate home size. Customers love them

  • 5
    1.5 pinned barrel

    Posted by David on May 9th 2020

    Top shelf quality. As a toolmaker I can pin a gas block but for the money it's not worth me setting up to do it. Beautiful work. I was going to message this with a Faxon BCG but after a months wait and only the boxed answer of "won't comment on delivery" I bought a Bravo Company BCG for it.