EGW's red dot sights are meant to be installed from the left to the right (with the muzzle facing forward). The dovetail has a progressive taper to allow for easier install. Simply remove the rear sight on your gun and replace it with EGW mount in order to mount your Vortex Viper/Venom, Burris FastFire, or Docter 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 Mfg: Egw