Weaver Steel Lock Mounts allow you to adjust the eye relief on your favorite scope. These solid, all-steel rings allow you to move your scope forward or back for optimum placement. Two straps and four screws provide added gripping power for these lightweight, all-aluminum rings. Thumbscrews allow for quick detach. Weaver rings can handle any scope-mounting need. Whether you're looking for our classic Weaver's original cross-lock Top Mount, windage adjustable or dovetail extension rings. we have many great options. These rings are available in a variety of choices including aircraft-grade aluminum options or Grand Slam steel, and many more. It should fit on Ruger 10/22 in 22 long rifle caliber (grooved & drilled) and the Ruger 10/22 Charger. It will not fit on the Ruger 10/22 Mag..