This red dot uses the Trijicon RMR footprint standard. Essential info Footprint standard: Trijicon RMR footprint standard Reticle: 3 MOA dot [red] Window size [height x width]: 19.0 x 24.1 mm [0.75 x 0.95"] Total dimensions [length x width x height]: 45.0 x 30.0 x 32.8 mm [1.77 x 1.18 x 1.29"] This red dot uses the Trijicon RMR footprint standard. Features Industry's First Magnetic Charging Cover: Osight introduces a pioneering magnetic charging cover featuring a battery display that reveals the precise battery levels for both the cover and the optic, making uncertainty certain. (70,000+ hours runtime on lowest mode, 17+ days on the brightest mode, extended to 70+ days with the charging cover.) 3 MOA in Large Window: Boasting a 0.94 x 0.85-inch lens, this optic ensures precise targeting even amidst recoil. The 3 MOA dot stands out clearly for quick and accurate dot acquisition. Unwavering Zero: Following a rigorous 10,000-round field test, Osight maintains zero calibration successfully, never lose your accuracy. Motion & Light Sensor: Turns off automatically after 10 minutes of inactivity, wakes it up in an instant. The auto-sensing mode chooses the best brightness for you, with 10 daylight levels and 2 night levels in manual mode and lockout mode, catering comprehensively to all usage scenarios. Most Common Footprint: By adopting the most common industry-standard mounting footprint (Ruggedized Miniature Reflex, 407c/507c footprint) for optic cuts, Osight ensures versatility and ease of integration.