Axeon Optics designed the ShotLine laser to fit three of the most common pump shotguns in the United States, the Mossberg 500, the Remington 870, and the Winchester SXP series shotguns. These popular tube magazine fed guns offer a mounting solution that can be utilized without needing a gunsmith to modify the gun. The ShotLine easily mounts on the end of the magazine tube replacing the existing magazine cap. Safe and convenient storage of the shotgun when not in use is not affected and handling of the shotgun while in use is virtually un-noticeable. With millions of these shotgun variants in people's gun safes, the ShotLine offers the shooter an easy to install, affordable aiming accessory that the multipurpose shotgun cannot do without. The ShotLine is a brilliant solution for your tactical and defense shot gunning needs..