This Warne Matte Scope Base is specifically designed for use on S&W K, L, N & X frame revolvers. Made from solid steel to handle recoil, this base is the first of its kind. The S&W rear sight is removed to install most scope mounts. Warne's base allows the user to reinstall the rear sight and front sight onto the top of the base. The factory sights are then fully functional. The base also accepts all Weaver style scope rings. Aluminum, space-saving, side-mount adapter fits on Picatinny rails to let you mount flashlights, laser-light systems, red-dot scopes, and more. Attachment leg doesn't interfere with the mounting of your scope; no need to sacrifice optics for accessories. Will not fit Weaver bases.