The Series 181 Ruger mini-14 rifle has remained a very popular rifle with hunters, outdoorsmen and women, and for home defense. Adding a scope mount and magnified scope or Red dot sight is a Great addition to your mini-14. The GG&G mini-14 side mounted scope mount provides a solid and rugged mounting base for your optic. Easy installation. No Gunsmithing or modification needed. 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 5 1/4 inch long. All edges have been deburred and softened to protect the shooter..