The LG-303 is an enhanced laser sight offering for Ruger SP101 revolvers. The LG-303 features a comfortable and ergonomic overmold material for a better positive-firing grip on the weapon. With a front activated switch, this Lasergrips model is engaged automatically as you hold the revolver naturally. The LG-303 installs in seconds and is fully adjustable for windage and elevation. Class 3R Laser Product (Does not exceed Class IIIA emission limits), ? 5mW power output..