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Had a random thought, what about an electric starter off of something like a riding lawnmotor to spin a ring gear. Since there wouldn't be much load and I doubt you would have it spinning for super long periods, over heating shouldn't be an issue and I'm guessing the gear ratio would probably...
I'm planning on doing a .50 replica but have already looked at some designs for a mini gun as well. Here are some of the dimensions I came up with when I was researching.