real miniguns sometimes overheat, this looks like it has room for a big motor to drive the barrel rotation but only three barrels how about reduced spin up time 60% noisier spin up faster shots 20% but overheats after 50 shots cools either 10 shots worth a sec not spinning or 20 a second spinning if it overheats deals 50 damage to you and cannot fire for 6 sec

(this would mean you would spin up faster and have enough shots to kill most enemies faster than the regular heavy gun (as long as you didn't miss) but another heavy would win in a straight up shoot out because you would either overheat or have to pause to spin the barrels without firing it also means that the faster movement allowed by reducing the spinup time would be offset slightly by spinning the barrels after combat to cool the barrels.