The Axeon Optics ShotLine 650X is a magazine tube mounted red laser that fits popular 12 gauge pump shotguns in the Mossberg 500, Remington 870, and Winchester SXP families. Adapters for each respective model are included with the ShotLine as well as three LR44 batteries, and the shims and tools used for mounting this laser to your shotgun. The ShotLine from Axeon is a great laser sight tool for home defense shotguns that helps you be clearly on target.