Identical to the scope mount used on U.S. Military M21 Sniper Rifles, this low-profile mount provides a solid, secure 9-slot, MIL-STD 1913 Picatinny rail for plenty of options in scope installation. No gunsmithing to install; clamps to grooves already in the receiver, with a third contact point for additional stability to ensure this mount will not move under hard recoil. Receiver plate screw and barrel ring stop are retained with C-clips to prevent loss. Won’t interfere with your rifle’s iron sights. NSN #1240-01-316-0055. Mfg: A.R.M.S.,Inc SPECS: 8620 steel, Parkerized, matte black. 43⁄8" long. 6.5 oz. (184g) weight. Fits M14-type rifles and clones with mil-spec receivers. Installation instructions included.