Fits: Mossberg 500, 590, and 590 Shockwave – 12 Gauge, drilled and tapped action required. Not sure it fits your setup? Crimson Trace LS-250G Lasersaddle Green Laser Mossberg 500 590 Shockwave 12ga. The Crimson Trace LS-250G Lasersaddle is purpose-built for the Mossberg 500, 590, and 590 Shockwave 12-gauge platform. It mounts directly to the drilled and tapped action – no rail required – and delivers a 5mW green laser through multiple ambidextrous activation points. Factory zeroed at 50 feet with a half-inch dot at that distance, it gives you a visible aiming reference in both daylight and low-light conditions without changing your grip. 5mW Green Laser – 520nm Wavelength – At 520nm, the green dot is visible across a broader range of lighting conditions than a comparable red laser, reducing the time needed to locate the dot on target. Ambidextrous Pressure Activation Pads – Multiple activation points on both sides of the unit mean left- or right-handed shooters can engage the laser instinctively without changing their grip or fumbling for a switch. Mount surface-Mounted Saddle Design – The saddle-style mount attaches directly to the drilled and tapped action of compatible Mossberg shotguns, keeping the laser centered and stable without requiring a rail or additional hardware. User-Adjustable Windage and Elevation – On-board adjustment screws let you zero the laser to your exact point of aim, so the dot always reflects where your load is going to hit. Master On/Off Switch – A dedicated master power switch lets you completely cut power to the unit when not in use, preserving battery life and preventing accidental activation during storage or transport. Rated for up to 3 hours of continuous run time at full power output. 12-Gauge Specific Fit – Designed exclusively for 12-gauge Mossberg 500, 590, and 590 Shockwave models with a drilled and tapped action, ensuring a secure, wobble-free fit that maintains zero shot after shot. Mossberg 500, 590, 590 Shockwave – 12 Gauge (drilled and tapped action required). Green Laser, Ambidextrous Activation, Master On/Off Switch. Message us before ordering.