The Monstrum FP 400 Lumens Weapon Light is the newest addition to our family of best-selling tactical flashlights. At 400 Lumens, the light is powerful enough for outdoor environments as well as for home defense weapons. Designed specifically for use with rifles or shotguns, the flashlight mounts securely to standard Picatinny rail systems. The Monstrum FP45 comes equipped with a powerful long-lasting 400 Lumens LED bulb for indoor or outdoor usage. The FP45 also features an integrated Picatinny rail mount with a Torx secured locking plate for seamless attachment to standard Picatinny rail systems. Included are both a traditional push button tail switch and a detachable remote pressure switch that allows for operation without removing your hand from the barrel.