Wrong -O skeeve.
"It is a common misnomer to refer to Gatling guns (rotary cannons) as chain guns. Certain Gatling do use a chain-gun mechanism; however, all Gatling guns are not inherently chain-powered weapons. Weapons such as the M61 Vulcan, the M197, the M134, and the XM214 are chain-powered Gatling guns." link
Awesome Video