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Yes, this pistol does have a threaded barrel. Per Ruger's product page on their website. Hope this helps! http://www.ruger-firearms.com/products/markIV2245Lite/specSheets/43909.html

Ruger Mark IV 22/45 Lite, Semi-Automatic, 22LR, 4.4" Barrel, Aluminum Frame, Bronze Anodized Finish, Threaded Barrel, Adjustable Rear Sight, 2 Magazines, 10 Rounds 43909

Yes. The thread pattern is 1/2"-28.

Yes, it is threaded in the same size that the Ruger 10/22's are (1/2"-28)