The Hi Viz MagniComp Shotgun Sight with Magni-Optic Technology. The only way your eye can tell your trigger finger to squeeze is if your head is in position and everything is lined up. Misalignment is the result of cross-eye dominance, stock fit or lifting your head. Magni-Optic Technology makes the problem instantly evident and aids in equally instantaneous correction. If the lights go out, “Don't shoot.” Fits virtually any vent-ribbed shotgun. It replaces your existing bead. Package includes two LitePipes, 1 green, 1 red, five different threaded size screws and key to interchange LitePipes.