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Hi Kent, the thread pitch is M18 x 1 and it has a 1:16 twist. Stay safe & have a great day!

Hi Kent and welcome. This model has a 22" Lothar Walther Threaded Barrel, Threaded M18 x 1 with a Rate-of-twist of 1-in-16. I highly recommend the M18 x 1 to 5/8 x 24 adapter for greater flexibility with muzzle attachment devices : https://hughesprecision.com/product/m18x1-rh-female-to-5-8-24-male-thread-converter/ ------------ Cheers, stay safe and enjoy!

TPI is M18 x 1 and it has a 1:16 twist.