Is your Ruger .22 pistol having light strikes or stovepipe jams? This Volquartsen tune-up kit is the fix. It's brand new, made in the USA, and designed for Ruger MK I, II, III, IV, and 22/45 pistols. The VC3FE kit includes upgraded parts that improve bolt function and firing pin impact. It helps eliminate those frustrating failure-to-fire moments when the primer doesn't get hit hard enough. Installation requires some gunsmithing skill, but it's a straightforward upgrade for anyone familiar with their Ruger. Bring back reliable performance to your favorite plinker or target pistol. Volquartsen is known for quality Ruger upgrades. Stop the misfires and enjoy smooth shooting again.