Simply remove the rear sight on your gun and replace it with EGW mount in order to mount your Trijicon RMR red dot sight. You can take the mount off and replace your rear sight at any time. Mounting hardware included. Installation Instructions Remove the rear sight* Install the EGW Sight Mount in the dovetail Tighten set screw (if applicable) Place the red dot sight on the EGW Sight Mount (placing a small piece of paper between the red dot sight and the sight mount will make for easier removal and will keep Loctite off of the red dot sight.) Apply blue Loctite to the provided mounting screws Torque mounting screws to 15in/lbs 2 Flat Head Ca Mfg: Egw