Does not seem to be an insurmountable problem.....but I have. noticed the pairing of a single mini-gun on one side with a M2 .50 cal or M-240 on the other side and always wondered about that.
The MH-60 M Penetrator has a fit of two forward firing 7.62 Mini-guns and also has an option for two .50 cal three barreled mini-guns. as some sources mention.
It sounded like it could also be fitted with two 30mm guns found on the Apache.
I wonder what the rest of the story is about all of this?