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This has a 16 inch barrel with a 1:7 twist ratio and is threaded with 1/2×28 thread pitch. I have a radical firearms pistol and great firearm. Hope this helps.

Blake, twist rate is 1:7, see all specs here >> https://gunzonedeals.com/product/rad-rad-15-rpr-5.56-16b-30r

Blake, one in seven (1 in 7) Right Hand Twist Rate. Cheers and Happy holidays! ---- 16" Barrel Material: 4140 Chrome Moly Vanadium Barrel -- Finish: Melonite Barrel - Profile: Socom - Barrel Thread Pitch: 1/2x28 - Chamber: 5.56mm - Twist Rate: 1:7