Sighting device that is used on firearms. Reflex sight is designed to help the shooter aim at a target more accurately. Reflex sights use a red dot or other illuminated reticle that is projected onto a clear lens, allowing the shooter to align the dot with the target. This type of sight is particularly useful for rapid target acquisition, as the shooter can keep both eyes open and maintain situational awareness while aiming. Reflex sights can come in a variety of sizes and configurations, and are commonly used on rifles, shotguns, and handguns.