Here is a photo I took on September 24th, 2010 while at Hell Survivors Tippmann Challenge Game with Thad “Weltman” Drum.
This photo shows Tippmann’s Minigun on the Hellhound. I’ll post some zoom in photos over tomorrow or the next day but I didn’t take many photos of it unfortunately.
Looks chain driven but doesn’t really offer much of a view on the operation. The side of the minigun has a Cyclone feed looking tube but I’m not sure if it was actually fed that way?