The MG42 guzzles ammunition when used the same way as other machineguns. But usually you pull the trigger not as long as you would with a slower weapon. You see a target and release a quick burst. The Wehrmacht had different philosophy according machineguns. The MG 34 and 42 were universal weapons, there is no separation in light and heavy machineguns. They are not intended to be fired when walking, which was important for the trench warfare. Therefore, they aren't magazine fed. Anyway, the rate of fire wasn't reasonable. Even if the sound and the effect were impressive, a little bit less would have been the better choice. I shot the MG 3 in the Bundeswehr and it was fast enough and the barrel change is very simple, but you need the glove.