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Hi Charles, this has a Black Nitride Heat Treated, 4150 CrMoV Steel Barrel with 1-7 Twist, 5R Right Hand Lands & Grooves, & 5/8X24 Muzzle Threads. Stay safe & have a great day!

5/8x24.

Hi Charles and welcome. It has a 5/8x24 tpi for muzzle brakes and/or suppressors: -- https://www.budsgunshop.com/search.php/q/5%2f8x24+suppressor ------------- Cheers, stay safe and enjoy!

Good evening to you!! The muzzle threads on the POF 300Blk is 5/8x24. Hope this helps. Have a good rest of your weekend. 🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸

The Thread pitch is 5/8x24.