Shotgun ownership requires you to perform maintenance and cleaning on your weapon every so often. If you use your shotgun frequently then a lot of lead particles and residue are going to build up inside the barrel. If you don’t clean these residue particles out then it could affect the overall functionality of the weapon. So you need to periodically take it upon yourself to clean the bore in order to preserve the life of your weapon.
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.