RFX35 1X22 MICRO GREEN DOT REFLEX SIGHT RMR stands for "Ruggedized Miniature Reflex". It is a standardized footprint that allows for secure attachment to the slide of many full-size pistols or onto a rifle's rail system. FEATURES: 3 MOA Green Dot 22x26 mm viewing window RMR Mounting Footprint & Picatinny mount included Auto shut off and INSTANT-ONA(R) technology High-grade aluminum alloy body, lightest in its class Designed from the ground up to ensure clarity, solid function, and rapid target acquisition Designed to fit full-size handguns, shotguns, and rifles With 2-night vision brightness settings, the R Mfg: Viridian