Trijicon SRO Adjustable LED Red Dot Sight with Glock mount and Battery REPRODUCTION Trijicon SRO Reflex Sight The Trijicon SRO (Specialized Reflex Optic) is designed with a maximized field of view and a clean, crisp red dot that deliver improved pistol accuracy and faster target acquisition. It’s also engineered with Trijicon’s legendary durability, so it can withstand abuse on and off the range. Every SRO features both manual and automatic LED brightness modes, and the SRO shares the same footprint as the Trijicon RMR. Additionally, a top-loading CR2032 battery provides a 3-year battery life (at setting 4 of 8).