LaserLyte's QD Universal Rail Mount System attaches quickly and securely onto all 3-inch barrel sub-compact pistols with rails and all other weapons with rail systems. The system is 50 percent smaller than previous versions and features an ambidextrous slide switch that allows the operator to activate the laser from the left or right side. Constructed of T6 aluminum for extra strength and durability the QD Universal Rail Mount System weighs .9 ounces and is available with the reliable 650nm laser module (maximum range of 500 yards at night).