Upgrade Your Furniture.The SureFire 628LMF-b dedicated forend WeaponLights replace the original forend of your Heckler and Koch MP5 submachine gun, HK53 rifle, or HK94 carbine, and provide high-intensity illumination required to dominate a low-light tactical situation. Each features a virtually indestructible Led emitter focused by a Tir lens, producing a brilliant beam optimized for close- to medium-range applications. The 628LMF-b uses two 123A batteries to generate 1,000 lumens with a runtime of 1.25 hours. The 628LMF-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, allowing positive control of the light while maintaining your normal firing grip..