LaserMax Uni-Max Red Rail Mount Laser with Integral Rail The Uni-Max Red weighs no more than a .45 ACP round and includes batteries Features super rugged, can also go diving to 66 feet and survives multiple drops to concrete, 350 degree fahrenheit The Uni-Max is a laser inside a Picatinny rail and has a mount gear on it Use on pistols, carbines, rifles, shotguns and more Maintains alignment through battery changes and optional momentary activation switch comes in 6 and 10 inch cords A super-reliable, super-handy, little laser and tactical lights and other lasers easily fit on top IIIA laser class, less than 5mw laser output