Factory Ruger Rebound Spring (firing pin spring) Support. Holds the rebound spring (firing pin spring) sets under the firing pin in the bolt. This ends up lost sometimes or messed up from not being installed properly. These will fit ANY Ruger Mark or Standard series pistol, YES Mark 1, 2, 3 AND 4 and the Standards, 22/45 & LITE. These supports vary in thickness from batch to batch, you may need to shape it for your spring to freely slide onto it. If this is beyond your skill set, find a gun smith.
Brand New Ruger Factory Part (We are a Ruger parts dealer)