https://midstatefirearms.com/product/3-9mm-ar15-ar9-58-24-threaded-barrel-raw-4150-uncoated/

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For your 9mm pistol build, works great with a suppressor. Most 9mm rounds won’t reach supersonic velocity with only 3″ of barrel length, so you can stay subsonic even with regular factory ammo.  uncoated 4150

  • 9mm 3-inch AR15/AR9 Barrel
  • 3″ length
  • 5/8-24 Threads