The Trijicon SRO (Specialized Reflex Optic) is specifically designed for pistol use. Improve shooting accuracy and speed with the wide circular field of view and clean, crisp dot making it easy for users to find and track while shooting. Every SRO has 8 brightness settings with “Lock-In” and “Lock-Out” modes and a 3-year battery life. The SRO similar to the Trijicon RMR easily mounts to popular red-dot-ready pistols, is compatible with most RMR mounts, and does not require a sealing plate. There is no need to dismount the optic for battery changes with a quick-change top loading battery. The SRO is designed to survive the rigors of slide ride pistols and is engineered for hard use. This 1.0 MOA Adjustable LED red dot is best suited for use on a rifle or target pistol application or in applications where increased accuracy at distance is needed.