M61A1 20mm Vulcan Cannon Specifications:

More M61 20mm Vulcan Gatling Gun Cannons at other Military Museums in the Northeast
An M61 Vulcan 20mm Gatling Gun at the New England Air Museum in Windsor Locks, CT	Another M61 20mm Vulcan Cannon Gun at the Watervliet Arsenal Museum in Watervliet, NY	An M61 20mm Vulcan Cannon Gun at the Vermont Militia Museum in Essex Junction, VT

Caliber: 20mm 6 barrel electrically driven Gatling Gun
Shell Weight: .22lbs
Shell Size: Overall - 6.62 inches, Projectile - 2.98 inches
Length: 6 feet, 2 inches
Diameter: 13 inches
Weight: 248 lbs
Action: Electrically driven Gatling Gun
Rate of Fire: 6,000 rounds per minute
Range: 1.1 miles air to air, 2.3 miles air to ground
Muzzle Velocity: 3,400fps
Magazine Capacity: 674 rounds in the F-14 Tomcat
Manufacturer: General Electric
Entered Service: 1959
Aircraft used on: F-104, A-7C, AC-47 Gunship, F-14, F-16, F-22, F-105, F-4E, AC-130 Spectre Gunship, F-15, F-18
Cost: $

Here's a Youtube video of the M61 Vulcan Cannon firing in an F-104 Starfighter