Now we’re talking. The M134 fires 7.62x51mm NATO rounds at a variable rate of 2,000-6,000 rounds per minute. It’s gatling-style six barrels are spun using an electric motor designed by General Electric and other brands. It makes a very distinctive “zipping” noise when firing. Here’s an example I randomly found on YouTube:
And here are more pictures of the one I saw on display at Knob Creek:
This one wasn’t for sale, but it sure was fun to look at.