It looks like that is an option!
"The icing on the cake though is the C-130J-SOF's ability to turn into an airborne death machine by strapping on a 30mm to its rear-paratrooper door..."
Nope, you would need to extensively modify the C-130 or any other aircraft to carry the seven-barrel Gatling that only the A-10 uses. The AC-130s of the USAF already have a smaller 30mm option.
https://en.wikipedia.org/wiki/Mk44_Bushmaster_II
Maybe it’s a different cannon than the A-10 uses? I just wondered how you would get something that big mounted sideways in a C-130.