Crimson Trace Corporation, Lasersaddle, Ambidextrous Activation, Fits Mossberg Shockwave/500/590, Black WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Pressure activation Red laser Factory sighted at 50Ft .5 inch diameter at 50 feet The LS-250 Lasersaddle(TM) is a feature-packed laser sighting solution for Mossberg 500, 590, & 590 Shockwave 12 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. As with all Crimson Trace laser sights, the LS-250 is user-adjustable for windage and elevation. The LS-250 features a Master On/Off Switch for completely powering down the system. This model provides 3 Hours of battery life with two provided CR2032 batteries. Fits Mossberg 500, 590 & 590 Shockwave in 12 Gauge only. Models must have receiver that is drilled and tapped. Does not fit 20 Gauge or .410 Bore.