LS-250G Green Laser Saddle for Mossberg 500 & 590 – 12 & 20 Guage, Shockwave 590 shotguns receivers. Multiple ambidextrous activation points. Battery Life 3 hours. Free batteries for life. Master on and off switch. Aftermarket accessory rail compatible. Factory adusted for 50 feet. User adjustable windage & elevation. Does not fit the Mossburg 500 ATP with our provided screws. Get your Crimson Trace laser today!