Gideon Optics Alpha Green Dot Reflex Sight (RMR compatible)The Alpha dot sight sets the bar when it comes to large window reflex sights. Built from field tested materials and designed with tactical features that improve accuracy, reliability, and acquisition, its ready for action. Features: Made with a 7075 T6 aluminum housingthe same alloy often used in firearms production for military rifles. Features the same mounting pattern as Trijicons RMR red dot sights for plate or slide mounting. A low profile 1913