Shotgun is mostly used on short distances, that is why you can see red dot or holographic non-magnifying sight on a shotgun more often than optic sight. Typically, red dot, reflex and holographic sights are designed for fast target acquisition usually within a 100-yard range, which is suitable for both hunting and tactical situations. Many shooting experts recommend that you shoot with both eyes open especially in a tactical situation. Red dot sights allow shooters to keep both eyes open because of the dedicated focusing of the sight. The shooting eye is not strained when using the sight.