I'm talking Lo-Tech here....lol.....I flew Hughes OH-6 helicopters for awhile and they came equipped with a mini gun that was absolutely useless for an observation helicopter....another pig in a poke!...we gave the mini guns to the gunships and went back to the old tried and true M-60 hanging off a bungee cord (a can of C-rations fit perfectly onto the M-60 and made a perfect feed device!)
Got it, smooth the ammo belt feed. Only used M-2 .50 fed from an ammo box hanging off the side so did not need that tweek. Should have checked out what the guys that flew on the gunships did. They had M-60 door guns.