I would say my personal favorite would probably be the soviet PPSh-41, highly dangerous at close range being called 'one of the most dangerous guns in the Korean war,' by many U.S officers for it's superior fire rate. General Hal Moore stated 'on full automatic it sprayed a lot of bullets and most of the killing in Korea was done at very close ranges and it was done quickly – a matter of who responded faster. In situations like that it outclassed and outgunned what we had. A close-in patrol fight was over very quickly and usually we lost because of it.' A fair bit lighter than more modern weapons, high fire rate and shoots 9mm rounds meaning lighter ammo and more space to fit more rounds compared to if it was a larger caliber, and an adaptable magazine being equipped to fit Maschinen Pistole 40 and sten magazines. I'd kill to get one, especially if it could be equipped to fire shotgun shells.