The MK-15 Phalanx is a weapon system for defense against incoming threats such as small boats, surface torpedoes, anti-ship missiles, and helicopters. Consisting of a radar-guided 20 mm (0.8 in) Vulcan cannon mounted on a swiveling base, the Phalanx has been used by the United States Navy and the naval forces of 15 other countries. The US Navy deploys it on every class of surface combat ships.
The MK-15 Phalanx is widely regarded as the deadliest gun ever made. The existence of this gun shows us the problem with our politicians. They would rather hit golf balls than hop on a ship and shoot awesome guns! come on man.
Watch a video of this gun here