The McDonnell Douglas M230 is a 30 mm calibre chain gun mounted on various aircraft, including the AH-64A attack helicopter. It has a variable rate of fire of up to 650 rounds per minute, a muzzle velocity of 800m/s and an effective range of 1500 to 1700 meters.
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http://www.probertencyclopaedia.com/browse/FMM.HTM
The McDonnell Douglas M230 is a 30 mm calibre chain gun mounted on various aircraft, including the AH-64A attack helicopter. It has a variable rate of fire of up to 650 rounds per minute, a muzzle velocity of 800m/s and an effective range of 1500 to 1700 metres.
Found on
http://www.probertencyclopaedia.com/browse/IM.HTM
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