Full-length Picatinny rail bolts to the RugerA(R) Gunsite Scout Rifle (GSR)A(R) with no gunsmithing required Provides a stable platform for standard optics over the receiver or for Intermediate Eye Relief scopes mounted farther forward in the classic scout configuration preferred by Jeff Cooper Built-in adjustable rear aperture is a handy backup sight For RugerA(R) GSRA(R) only; 11 1/2" L; includes hardware and threadlocker Mfg: Xs Sight Systems