Unlike other firearms, shotguns usually do not have rear sights. Instead, most shotguns have a bead at the muzzle end and a ventilated rib on top of the barrel leading up to the bead. When pointing a shotgun at a target, the rib and front bead should be aligned so that you are looking straight down the barrel. Then you will properly hit the target. If the bead appears to be higher or lower than the rib, you are not looking straight down the barrel and the shot will not hit your intended target.