Victoptics V3 1x17x26This red dot uses the Trijicon RMR footprint standard. Essential info Footprint standard: Trijicon RMR footprint standard Reticle: 3. 5 MOA dot [red] Window size [height x width]: 17 x 26 mm 3. 5MOA Dot Size with 6 Gears Red Illumination Setting, Switch on Side, 21 mm Weaver Mount 17x26 mm window Size, MOJ footprint Compatible with R. M. R, Rubber Lens Cover Magnification N A Window Lens Size 17x26 mm Parallax Free (<1 MOA) Parallax Setting Dot Size