https://midstatefirearms.com/product/5-9mm-ar-pistol-sbr-barrel-5-8-24-nitride/

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Get your 9mm Ar-15 build, Ar-9, whatever you want to call it, started off right with this shorty pistol ar9 barrel. Threaded 5/8-24. The 5″ barrel will clear most 4″ rails, so this is a great option for running with a suppressor as well. Barrel has an index pin and conical feed ramp.