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Stern 9mm barrels are ideal for gun lovers who want to build their own custom dedicated 9mm  AR15 upper group. Our barrels offer an advantage over the competition.  Every stern defense barrel throat is machined deeper for a longer free bore to accommodate bullets with a longer ogive.  We have found, some common defense rounds jam into the rifling before the round is fully chambered. Some of the barrels on the market do not accommodate this and can and will potentially result in nasty malfunctions resulting in a round being stuck in the chamber either requiring firing to clear or manual methods.

Note: Barrel comes with locating pin installed.


  • Barrel length is measured in overall length.
  • Caliber: 9mm.
  • Length: 8.5 Inches.
  • Made in the U.S.A.
  • Threaded 1/2-36.
  • 1:10 TWIST.
  • 4150 Chrome-molly steel.
  • Melonite coating.



2 Reviews Hide Reviews Show Reviews

  • 5
    ar 9

    Posted by Ian on May 13th 2020

    Very good fit and finish. Fit smoothly into an anderson slick side lower. The fitment was probably the best i've seen on an ar15 barrel.

  • 5
    8.5 inch barrel

    Posted by Michael on Jun 9th 2019

    I used this along with Stern’s other parts to build up a AR pistol. I’m using the 11 ounce buffer which has softened the recoil. The H3 works great also. I wanted the heavier one for later when I build a 45 setup. I don’t have many rounds throughout it yet only about 700 or so. These have been all FMJ with a mix of 115, 124, and 147 grain so far it’s been 100%. Was hitting a 6” plate at 90 yards so it’s accurate enough. Stern Defense has a winner with this one.