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In page M61 Vulcan:

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Each of the cannon's six barrels fires once in turn during each revolution of the barrel cluster. The multiple barrels provide both a very high rate of fire—around 100 rounds per second—and contribute to prolonged weapon life by minimizing barrel erosion and heat generation.[1] The average time between jams or failures is in excess of 10,000 rounds, making it an extremely reliable weapon.[2] The success of the Vulcan Project and its progeny, the very-high-speed Gatling gun, has led to guns of the same configuration being referred to as "Vulcan cannons", which can sometimes confuse nomenclature on the subject.[citation needed]