When it comes to on-board equipment for your rifle, having a laser-aiming aid combined with an illumination tool is about all you need, and the Holosun LS420 is designed to keep things simple and intuitive, thanks to its co-axial laser and flashlight design. The entire unit is powered by a single CR123A battery, which provides a battery life of 8 hours. Machined from aluminum, the housing mounts to any standard Picatinny rail, so you can add this to your defensive firearm of choice with ease. Mfg: Holosun