Strong, lightweight aluminum mounts provide a secure, solid platform for Trijicon's RMR(TM) red dot sights. Steel RM44 allows an RMR to be mounted on Glock pistols in place of the rear sight. Mount behind your primary optic for fast transition from a magnified view to close-in sighting by rotating the rifle slightly. Locking bar and easy-to-grasp grooved thumbscrew ensure fast attachment. Glock MOS slides are not included. Mfg: Trijicon SPECS: Aluminum, hardcoat anodized matte black. Heights measured from top of rail to bottom of sight. Fits Picatinny rails. RM44 - Steel, oxide coated, matte black. 9/64" (3.6mm) high. Glock MOS slides are not included.