The Trijicon Specialized Reflex Optic (SRO(TM)) 5.0 MOA Adjustable LED red dot is best for applications in which speed and recovery of the dot is critical such as in competitive shooting. The wide field of view and clean, crisp dot makes it easy for users to find and track the dot in both target and competitive shooting applications, helping improve shooting accuracy and speed. Every SRO features both manual and automatic LED brightness modes and a 3-year battery life. The SRO is designed to survive the rigors of slide ride pistols and is engineered for hard use. It shares a similar electronics design with the proven Trijicon RMRA(R). Like the RMR the SRO is forged from 7075, T-6 aircraft grade aluminum, making it much more durable than conventional red dot sights. This forged housing protects the lenses and electronics, and it has been tested to survive typical pistol mounted drops. NOTE: If selecting an SRO for mounting on the GlockA(R) MOS, SpringfieldA(R) OSP, WaltherA(R) PDP, or H&KA(R) VP9 Optics Ready, a Trijicon SROA(R) mounting kit (AC32085) is required. Large, Unobstructive Field of View Parallax-free and compatible with suppressor-height iron sights. Easy, Adjustable Windage & Elevation Tool-less design makes zeroing hassle-free. Same Footprint as RMR Mounts easily using the same base as the Trijicon RMR. Clear, Crisp Dot Fine-tuned, illuminted reticle, coupled with exceptionally clear front lens, offers a clear sight picture with a crisp dot. Top-Loading Battery Makes battery-switching fast and easy. Complete User-Control Illumination Settings 8 brightness settings, including 1 super bright mode and 2 night vision modes. Button "Lock-Out" Mode Secures the Auto-Brightness setting feature- ideal for everyday carry and hunting. Button "Lock-In" Mode Secures the user-chosen brightness setting indefinitely- ideal for competition and target shooting. Waterproof Up to 10 Feet Made with durable 7075-aluminum housing. Red Dot Pistol Ready Designed to fit on many of the most popular red-dot-ready brands on the market.