The SureFire 328LMF-B Forend LED Weapon Light replaces the original forend of your Heckler & Koch MP5 submachine gun, HK53 rifle, or HK94 carbine, and provides the high-intensity illumination required to fully illuminate any low-light close- to medium-range tactical situation. It features a powerful LED emitter that is focused by a Total Internal Reflection (TIR) lens. This combination produces a 500-lumen beam defined by a tight bright circle of light in the center to clearly illuminate your subject with a generous spill to help you maintain situational awareness. The 328LMF-B features a single momentary-on pressure-pad switch integrated into the right side of the forend and a rocker-type constant-on switch on the left side, providing positive control of the light while maintaining your normal firing grip. To withstand repeated firing recoils, the forend is made of a lightweight and durable aluminum alloy treated with a scratch-resistant hard-anodized finish. The 328MF-B is 8.1" long, weighs 9.6 ounces, and runs on one included CR123 lithium battery.