This red dot uses the Shield RMSc footprint standard. Essential info Footprint standard: Shield RMSc footprint standard Reticle: 6 MOA dot [red] Window size [height x width]: 14.0 x 21.0 mm [0.55 x 0.83"] Total dimensions [length x width x height]: 40.5 x 25.0 x 24.5 mm [1.59 x 0.98 x 0.96"] Features 6 MOA Red Dot: A 6 MOA red dot enables faster target acquisition and more forgiving alignment, making it highly effective in high-stress scenarios such as self-defense, home defense, and duty use. Enclosed Emitter Optic: With a fully enclosed system, the optic offers unmatched protection against the elements, ensuring reliable performance in any environment. Side-Loading Battery: Effortless battery replacement without removing the optic, avoiding the need to re-zero. A high-end CR1620 battery offers easy accessibility while maintaining steady performance. Aspherical Lens: The aspherical lens ensures zero distortion, parallax-free performance, and exceptional clarity for rapid, precise target acquisition. RMSc Footprint: Fits directly to your optics-ready slides, delivering exceptional compatibility and seamless integration across a wide range of builds.