Crimson Trace 0178101 LaserSaddle Fits Mossberg 500, 590/Shockwave 590 Red LaserThe Lasersaddle is a laser sighting solution for Mossberg 500, 590 and 590 Shockwave 12 20 Gauge Shotguns. Attaching seamlessly to the receiver, the LS 250 provides multiple ambidextrous laser activation pad points for instant targeting with a powerful 5mW red laser. User adjustable for windage and elevation. Features a Master On Off Switch for completely powering down the system. Includes two CR2032 batteries. *Fits Mossberg 500, 590 & 590 Shockwave