https://midstatefirearms.com/product/16-9mm-black-nitride-ar15-ar9-barrel-1-2-28-threads/

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Get your 9mm Ar-15 / Ar9 Rifle build started with this barrel. 1/2-28 threads, conical feed ramp, and a nitride finish. Works great with our 9mm bolt carrier groups and uppers as well.