Crimson Trace LG-420G Laserguard Sig Sauer P320 (M7,M18) Laser Sight - Green - The Crimson Trace LG-420G Laserguard is a powerful green laser sight for the Sig Sauer P320 pistol, (also known as the M17 in full-size and M18 in compact). The LG-420G is quickly and easily user-installed in moments and offers a front activation button powered by Crimson Trace's Instinctive Activation technology. The laser sight will provide two (2) hours of battery life with a single 1/3N Lithium battery and features a quick change battery cover for replacement without removal of the unit. As with all Crimson Trace laser sights, the LG-420G is completely user-adjustable for windage and elevation. This model features a Master On/Off switch for completely powering down the unit to train without the laser sight. Fits all P320 models except subcompact frames. Sig Sauer P320: Laser Sight For Sig Sauer P320 (M17,M18) Pistols Except Subcompact Frames; Front Instinctive Activation Button For Immediate Laser Deployment; Powerful 5MW Red Laser - The Brightest Allowed By Law - For An Immediate, Decisive Advantage; The LG-420 Is Factory Sighted At 50ft But Is Completely User-Adjustable For Windage And Elevation With Supplied Tool;