Mesa Tactical SureShell Carrier and Reflex Red Dot Sight Mount Benelli M2 Tactical Aluminum 4-Shell 12 Gauge Trijicon RMR 4.5 in Black. When installed on the shotgun the RMR sight co-witnesses with factory ghost ring sights. Specifications for Mesa Tactical SureShell Aluminum Carrier and Reflex Red Dot Mount: Manufacturer: Mesa Tactical Color: Black Finish: Matte Gun Type: Shotgun Fabric/Material: 6061-T6 Aluminum Red Dot Sights-Footprint: RMR Weight: 0.46 lb Features of Mesa Tactical SureShell Aluminum Carrier and Reflex Red Dot Mount Includes an integrated Trijicon RMR reflex sight mount that co-witnesses with factory ghost ring sights Innovative rubber friction retention system solidly holds shotshells in place Mounts via drilled and tapped receiver holes Lifetime warranty Package Contents: Mesa Tactical SureShell Aluminum Carrier and Reflex Red Dot Mount Mesa Tactical 95190: SureShell Carrier and Reflex Red Dot Sight Mount Benelli M2 Tactical Aluminum 4-Shell 12 Gauge Trijicon RMR 4.5 in Black