Optimize your Benelli M1S90/M4 with Meprolight's Tru-Dot illuminated shotgun sights. These sights are bright enough to be visible in low light situations, but not too bright that it impacts your sight picture. These sights are in the Ghost ring configuration, and are identical in appearance regardless of the lighting conditions. Features: Easy installationSeamless transition from day to night useDurable construction Meprolight Tru-Dot Benelli M1S90/M4 (Post 2001)/Screw (Ghost Ring) Fixed Green Rear/Front Tritium Illum Shotgun Sight Set 1343023101