There were two of them at Knob Creek the last time I visited. The sound on that little video doesn't do that mg justice. It's more like a very loud 60 cycle hum when it's running. I've seen that mg in action. At KC they were shooting things like refrigerators, washers, and driers in addtion to cars, boats, etc. ,etc.
In one particular shoot, they concentrated on this drier. When they were finished, we walked out into the range and found that the minigun had literally melted the aluminum housings of the motor and frame and it actually puddled on the ground. A kid picked it up and it was the size of a large dinner platter. It's an amazing weapon, super-duper expensive, and you have to own an ammo company to feed it. But, it sends lead downrange at a speed that's incomprehensible. I, for one, can't imagine what it must have been like to be on the receiving end of one of those in battle.
BTW, that guy spend probably upwards of $75-$100 for that little tickle.