The XS Lever Rail features multiple optic mounting options. The Lever Rail mount is an extend scope base with a long picatinny rail mounting surface. The extended rail allows you to mount optics in the tradition position over the receiver, or forward mounted in a "scout-scope" position. This rail will work with weaver or picatinny style rings. This optic mount is designed for round barreled models only, it will not work with octagonal barrels.