MPN: 15A910N4NLQ / 15A910N8NLQ


  • 11-degree target crown to ensure superior accuracy
  • All Faxon 9mm barrels are individually checked for headspace by precision custom hardened gauges
  • Pencil profile - ideal balance of weight and performance
  • Button rifling for better accuracy
  • Magnetic particle Inspection (MPI), air-gauge tested, and fully stress relieved
  • QPQ Nitride corrosion resistant finish

*A barrel that is shorter than 16" is only for use on a pistol configuration firearm or a NFA registered Short-Barreled Rifle (SBR). All NFA laws apply!


  • Caliber: 9mm
  • Length: 4.5" and 8.5"
  • Twist Rate: 1:10 Twist
  • Material: 4150 Steel
  • Muzzle Thread Pattern: 1/2"-28 TPI
  • Profile: Pistol Caliber Taper
  • Finish: QPQ Nitride
  • Weight:
    • 4.5-Inch: 8.54 oz.
    • 8.5-Inch: 12.66 oz.


  • AR-15 upper receivers


When you set out to build a 9mm AR pistol or SBR, the rules are a little different. Your goal is full-tilt, premium performance in a compact package. To achieve this, the quality of every part is critical. You can't order just any 4.5 9mm barrel and expect good results. Now is the time you look to Faxon Firearms for the vital parts of your build.

What's The Big Fuss All About?

We know that the 9mm runs wonderfully in a short or suppressed firearm. When you go there, the level of heat and stress on the weapon becomes a factor. You're lucky you found this page. Because the Faxon Firearms 9mm AR Barrel gives you high-quality at a moderate price. Whether you go with the 8.5 or the 4.5 9mm barrel, you will find that it outperforms our higher priced competitors. That's a novel idea in today's world. Quality, and value at a reasonable price are hard to find.

Floating On Cloud Nine

The Faxon Firearms 9mm AR Barrel has a tapered profile. This element makes it light and very controllable, exactly what you need in a Pistol or SBR. Faxon Firearms chose 4150 steel to begin your 4.5 9mm barrel. Then they made it better with a deliberate QPQ finish inside and out. On the inside, you find a SAAMI spec chamber and 1:10 button rifling. This combination gives you the optimum set-up for the 147 gr 9mm ammo that most competitions run. Of course, the Faxon Firearms 9mm AR Barrel comes threaded to handle your compensator or suppressor. When you put it all together, you just found the 9mm barrel for your new build.

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