This is a Crimson Trace Corporation Laserguard known as the Laserguard, model LG-416G.
The LG-416G Laserguard(R) is a powerful green laser sight designed to fit the Ruger LC9" LC9s and LC380. This model features Crimson Trace's famed Instinctive Activation(TM) which allows the unit to be activated when the pistol is held in a normal firing grip. A master on/off switch is also included for completely powering down the system. The LG-416G is quickly user-installed in moments with no modifications to the firearm and is fully adjustable for windage and elevation. This product is eligible for our Free Batteries For Life program.
Features:
Front activation
Green laser
Factory sighted at 50Ft
.5 inch diameter at 50 feet