Fits Mini-14 series 181 and newer Non RANCH RIFLE models; Easy installation; No gunsmithing or modification needed to your Ruger Mini-14; Bolts to the side of the receiver with a new replacement bolt stop cover plate; The mounting rail is adjustable allowing for alignment with barrel and receiver; Includes the all important extended bolt hold open button; Features a dual locking screw leveling system; Package includes all necessary mounting hardware and tools; Mounting rail is manufactured to MIL-STD-1913 specifications; Designed as a "See-Under" type allowing use of iron sights