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no it fits 22/45 MK1 MK2 Mk3 only see **** Specifications and Features: Tactical Solutions Pac-Lite Receiver PL4.5TENF-04 Serialized Portion, Requires FFL Transfer .22 Long Rifle 4.5" Threaded Barrel 1:16" Twist Rate Threaded 1/2x28 Non-Fluted Drilled and Tapped for Pac-Lite Scope Base Solid Piece of Aircraft Aluminum Overall Weight 6.2oz Olive Drab Green Includes: Tactical Solutions Pac-Lite Receiver Thread Protector Fits: Ruger Mark I, Mark II, Mark III and 22/45 Frames *******Note: Does NOT fit the Ruger Mark 4

Hi Timothy and welcome. Unfortunately, no Sir. It does not fit the MK4 currently. Cheers and stay safe!

Hi Tim, this fits Ruger 22/45 , Mark I , Mark II , Mark III. Unfortunately is will not fit tyhe Mark IV Stay safe & have a great day!