https://midstatefirearms.com/product/16-non-threaded-ar-15-upper-300-blackout-with-mlok-handguard/

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Professionally assembled Ar15 upper with unthreaded barrel. Whether you just want a crowned barrel or need it nonthreaded for compliance purposes, we’ve got this ar upper available for your ar15 rifle build.

• 16″ 300 Blackout 1:8 Nitride barrel
• 4150 chromoly vanadium cmv barrel
• 300 BLK
• Target crown
• Mid length gas
• .750 gas block diameter
• Steel low profile gas block
• Stainless gas tube
• 7075-t6 mil spec aluminum receiver, anodized black
• Dust cover
• Forward assist
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