What if we doubled up and put two M-2’s on a humvee mount. They used quad 50’s in Vietnam . Also redesign the ammunition to include exploding shells in the belt
I would second that. Also the Russian type large machine guns in 14mm or so. Heck, even a 20mm machine gun exists out there that can be easily crew maintained and with as much power if not more than the Bushmaster 30 mm.
The Bushmaster has a complex timing system of shell delivery and ejection using gears and bike chain that is very delicate. It is fine with an aircraft away from dirt, but on the ground like this and you will quickly chaff the gears and thus loose the timing.