The M61 is a six - barreled 20mm rotary cannon , which fires at up to 6,600 rounds per minute .
The M61 Vulcan 20 mm autocannon is the most iconic member of a family of weapons designed by General Electric and currently manufactured by General Dynamics .
The M61 Vulcan is a six - barreled 20mm rotary cannon , which fires at up to 6,600 rounds per minute .
The M61 Vulcan 20 mm autocannon is the most iconic member of a family of weapons designed by General Electric and currently manufactured by General Dynamics .