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Hi Thomas and welcome. No Sir, this Barrel is not threaded. Cheers and stay safe! https://cz-usa.com/product/cz-457-american-combo/

Thomas, this is a non-threaded barrel. Stay safe & have a great day!

Thomas, this barrel is not threaded. A gunsmith should have no problem threading it for you with 1/2×28 threads. Sorry but hope this helps.