M61 Vulcan is ahydraulic andpneumatic autocannon. It has sixbarrels. It is cooled by air and fires by the power of electricity. It is aGatling-style rotary cannon. The size of its caliber is20 mm. It has a very highrate of fire. It has been the main gun ofUnited States militaryfixed-wing aircraft since the late1960s[1] and is also used elsewhere. It was made byGeneral Electric at first, and later byGeneral Dynamics.[2]
