Sitting in a concrete bunker with an MG42 is a solid plan for survival… until that Iowa class Battleship shows up off the coast.MG 42 is right there if I'm going to war with a will to conquer (vs survive).
But since no one has mentioned it, I'll take a comparable type very much in the same league, the Solothurn MG 30.
Which for actual WWII use means the Hungarian version, Solothurn 31.M Golyószóró in 8x56R.
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A Louis Strange design, FG 42 predecessor and origin of the Luftwaffe's MG 15 and MG 17 aircraft-mounted MGs.
At 21 lbs* it could be a little lighter but not much sleeker - this is Star Wars worthy. Up to 900 rpm.