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Hi Timothy and welcome. Yes Sir. Fits: Ruger Mark IV and Mark IV 22/45 Only Does Not Fit: Ruger Mark I, Mark II, Mark III and 22/45 Cheers and stay safe!

yes it will. It fits Ruger® Mark IV™ or Mark IV 22/45™

Hi Tim , yes sir, this fits the Mark IV 22/45. The Tactical Solutions' PAC-LITE IV pistol barrel is a lightweight and accurate .22 LR barrel and receiver for the Ruger® Mark IV™ or Mark IV 22/45™ barrel. Stay safe & have a great day!