Have a look at USS George H.W. Bush Aircraft carrier Cannon that can Fire 4,500 Rounds a Minute. The Phalanx CIWS is the nickname given to a 20mm Vulcan Cannon on board the USS George H.W. Bush aircraft carrier.
It fires 4,500 rounds a minute, can hit a target five miles away and has bullets that are twice the normal size.
The Phalanx CIWS is a close-in weapon system for defense against anti-ship missiles.
It consists of a radar-guided 20 mm Vulcan cannon mounted on a swiveling base
Here is another Video of Phalanx CIWS Close-In Weapons System • Live Fire Test. Footage shows loading the Phalanx Close-In Weapons System (CIWS) “seewiz” and test firing from three different U.S. Navy ships – USS Underwood (FFG-36), USS Nimitz (CVN-68), and USS Antietam (CG-54).
20 mm M61 Vulcan Gatling gun autocannon is linked to a Ku-band radar system for acquiring and tracking targets. The CIWS is a radar-guided 20 mm M61 Vulcan Gatling gun autocannon used primarily for defence against anti-ship missiles.
It is installed on all U.S. Navy surface combatant ships and is capable of locking onto incoming missiles and firing 4,500 rounds per minute.
The entire unit has a mass between 12,400 to 13,500 lb (5,600 to 6,100 kg).
Because of their distinctive barrel-shaped radome and their automated nature of the operation, Phalanx CIWS units are sometimes nicknamed “R2-D2” after the famous droid character from the Star Wars films