Abstract: A lightweight illumination source and illumination mount system consisting of an illumination device that may be a small flashlight or laser, and a mount that can be detachably secured to a family of firearms, namely pistols, revolvers, and long guns. The illuminating system, consisting of flashlight and mount, may be attached to the base of a pistol grip by removing the floor plate from the pistol's magazine and installing the mount in place of the original magazine floor plate. The magazine's spring seat(insert) locks the mount in place. Another variation of the invention may be mounted to the butt of a revolver. The resulting Integrated Weapon/Illuminating System provides the user the capability to simultaneously activate the illuminating device while using a standard two handed grip on the firearm, and if the need arises, the capability to operate both light and gun with one hand, while performing other tasks such as finding a light switch, making a phone call, etc.