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I see a trend in all the choices, they are all SMGs, NOT assault rifles.the MP-44
The sten was a peice of crap apprently, a friend of mine who was in the Royal Marines from 1947 to 1958 i beleive said that the damn thing was made from old bicycle parts and what not
My vote goes to the PPSh-41. Typically Russian: Simple, rugged, reliable, and lethal as all hell.
I think the Finnish Suomi should be on that list, even though it predates WWII.