Material: 7075 Aluminum Coating: Matte Black Hardcoat Overall Length: 1.811" Overall Width: .99" Mounting Hardware: (2) 6-32 Flat Head Screws, (1) 6-32 Set Screw Red Dot Fitment: Trijicon RMR Please take note to the Pre 2017 and Post 2017 differences when placing your order. Pre 2017 rear shelf behind the dovetail is .187" Post 2017 rear shelf behind the dovetail is .120" Simply remove the rear sight on your gun and replace it with our mount in order to mount your Trijicon RMR. No alterations are required. You can take our mount off and replace your rear sight at any time. Mounting hardware included. Installation Instruc Mfg: Egw