monstrum 1 inch picatinny rail mount for flashlights monstrum the monstrum tactical 1" picatinny rail mount is designed to mount tactical flashlights to rail equipped rifles and shotguns. the rail mounts to any picatinny 1913 standard accessory rail. the mount is 1" in diameter, handling many standard sized tactical flashlights. crafted from high quality aerospace grade aluminum, the mount is 1.8" in length, 1.6" in height, and 1.6 ounces in weight.