The Trijicon SRO 2.5 MOA is built for competition, duty, and self-defense applications. This waterproof red dot optic has the same footprint as the RMR and can mount onto shotguns, rifles, and pistols. Shooters can quickly acquire targets in the parallax-free window thanks to the wide field of view and crisp reticle. The Trijicon SRO sight 2.5 MOA has automatic and manual LED brightness modes for varying light conditions. It has a three-year battery life, and it is easy for shooters to swap the top-loading battery.