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.
Eotech shotgun integrated forend light for Remington 870 is available for ordering. It looks great and I really like it. It would be interesting to order and test one or even compare Surefire and Eotech forends.
Holographic Weapon Sight which is often called red dot sight or reflex sight, it can be used with shotguns.
I receive a lot of questions about use of holographic (reflex) sight on a shotgun. This post is a small review of the Eotech 512 holographic sight (there are more compact new versions available) and my thoughts about holographic sights on shotguns.