The Submachine Gun is a fast-firing weapon with a large magazine size and low overall recoil, making it useful when engaging multiple enemies up close or for sniping. Ammunition for this weapon is very easy to find due to it sharing the same pickup type as the Handgun 1946, though firing it wildly would still result in shortage.
Although handy to have, the Submachine Gun is quickly supplanted by the vastly more useful Assault Rifle 1946, which can be picked up from the first enemy soldier encountered. Compared to its replacement the Submachine Gun is substantially weaker, harder to get ammo for and cannot be dual-wielded.
It does not make an appearance after the timeskip nor does it have a 1960 counterpart.