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Hi Neil and welcome. Yes, the barrel is threaded 1/2 x 28. Cheers, stay safe and enjoy!

Hi Neil, I disagree with the other answer, the barrel is not threaded on this model. The model with the threaded barrel is here https://www.budsgunshop.com/product_info.php/products_id/141877/rock+island+armory+tm22-a-18+tm22+.22+lr+18+10+1+overall+black+anodized+7075+aluminum+m-lok , Stay safe & have a great day!