This item at SKDTac looks good on a .45 pistol... "The M3X is a compact, lightweight, visible illuminator that emits a highly concentrated beam of light for acquisition and identification of targets. The M3X can be handheld, or mounted to hand gun and long gun weapon systems. The M3X is powered by two 3 volt lithium batteries. When used with an infrared filter, the M3X can be used with Night Vision Devices to accurately direct fire as well as illuminate and designate targets.