Modern mini guns are just the evolution of the original gatling gun, electrically driven instead of hand cranked. As mentioned, barrel cooling and high rates of fire are big factors. The A-10’s GAU-8 is a classic example. As some wag once said, “If dragons were real, that is the sound dragons would make”:
[https://youtu.be/3Io96sA63Wo](https://youtu.be/3Io96sA63Wo)
The GAU-8 Avenger:
[https://en.wikipedia.org/wiki/GAU-8_Avenger](https://en.wikipedia.org/wiki/GAU-8_Avenger)
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