in my personal experience, the drum magazines run out of ammounition, so a boost of about 50% to all magazines(excluding machinegun boxes and high caliber cannon belts) would be helpful in terms of balancing. Also, one more thing; i think there should be a possibility to belt feed ordinary machineguns in order to fix-mount them on planes and such, thus making thing a little more realistic. Of course, the standard machinegun ammo box should remain a thing in the game, but adding an option to belt feed machineguns is particulary useful.