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A 20mm 6 barreled anti-missile CIWS (close-in weapons system) mounted on aircraft carriers and other ships. Designed to be a point defense system, it is the first effective design able to shoot down most anti-ship missiles, including High-g Maneuvering sea skimmer missiles. It's six barreled Vulcan cannon can fire at about 4,500 rounds per minute, creating a virtual wall of lead in front of the enemy missile.
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