General, Reviews

Initial Impression: Faxon 18″ Gunner Barrel

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I received this in the mail over the weekend. It is a Faxon Firearms 18″ Gunner barrel. Here are the key stats from Faxon’s web page:

  • Barrel Type: Button Rifled
  • Barrel Caliber: 5.56 NATO
  • Barrel Twist: 1:8
  • Barrel Length: 18″
  • Barrel Profile: GUNNER Light Hybrid
  • Barrel Gas System: Rifle Length
  • 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
  • Magnetic Particle Inspected!
  • 11-degree Target Crown
  • Weight: 1.44 lbs

This is part of my KISS walk-around rifle concept, which I wrote about a while back. The intent is for a lightweight iron-sighted rifle that would make a great companion for walking around in open areas, or handing off to someone as an introduction to marksmanship. This is my original mockup done through Gunstruction.

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I already have the lower assembly complete, which leaves the upper receiver, operating parts, and final assembly.

This barrel makes a very positive first impression. The QPQ/Melonite/Nitride coating is a nice even black. While not as flat as a parkerized barrel, it is not really shiny, either. The machine work appears very clean, with no sharp edges or burrs in the threading. I don’t have a bore scope or lathe to check for runout or rifling quality, but the buzz on the internet was that both have proven to be good.

The profile is the most interesting part to me, though. Notice that it continuously tapers from chamber to the gas block journal (which is sized to accept a standard .625 FSB), and then continues the taper down to the end. The muzzle end flares out a bit again to allow for solid contact with a muzzle device. The section in front of the gas block journal might be one of the thinnest profiles I’ve seen on an AR.

I happened to have enough spare parts on hand to get a better mockup and play with weight/balance a bit. I grabbed my old Spikes stripped upper, standard barrel nut, Samson/Rainier Evolution rail, and a birdcage flash hider and slapped it together (nothing fully torqued, of course). I borrowed a BCG and charging handle from another rifle.

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I’m not going to lie, this feels pretty damn nice. I’m almost tempted to mount a gas block, torque it all down and call it good. The rifle feels very spright in the hands, with a good rearward balance at about the middle of the magazine well. The Samson/Rainier rail weighs 11 oz, not including the standard barrel nut. The Mapul MOE Rifle handguard I will be using weighs just a bit more, at 12.2 oz. I also have to include another .8 oz for the handguard cap and delta ring assembly, which I don’t have mounted here.

In any case, a bit more forward balance by a few ounces would still leave a very nice handling rifle. I still need to order a few more parts, and then send it off to have the FSB drilled and taper pinned. I will probably have final assembly done at the same time.

The more parts that come in, the more excited I am to have this project complete.

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6 thoughts on “Initial Impression: Faxon 18″ Gunner Barrel”

  1. Nice! This barrel is one of the few things in the AR market right now that truly holds my interest. I want to see what your fully developed opinions are.

    1. Pete, that’s pretty much exactly what it is. I briefly mentioned it in my writeup on AR barrels, calling Nitro Carburizing. My understanding is that it uses a process to dramatically increase the hardness and corrosion resistance of the surface of steel. The touted benefits is that it allows manufacturers to use CMV barrels machined to thin profiles, and not affect accuracy by using chrome. It is all the rage these days, but I can’t definitively say it is better. I’m thinking that this subject my warrant a new post all together.

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