SureFire's 623LMG-B Forend Weaponlight is the ultimate upgrade for your Mossberg 500/590 shotgun. This light system is installed by removing your shotgun's original forend and replacing it with the 623LMG-B weaponlight. The 623LMG-B produces an extremely powerful 1000 lumen beam of blinding white light from a nearly indestructible LED emitter and focused with a Total Internal Reflection (TIR) lens. The result is an illumination range of up to 200 meters. The 623LMG-B has three modes: momentary-on, constant-on, and disabled. Momentary-on is activated by pressing the pressure pad and will remain active until the pressure pad is released. Constant-on is activated by pressing the rocker-switch and will remain on until it's switched off. Disabled mode completely deactivates the 623LMG-B and allows for safe transportation and storage. With its aggressive 1000 lumen beam and 1.25 hours of battery life, the 623LMG-B is an outstanding addition to any home defense arsenal.