Yes or no, depending on the source. Some sources only consider weapons a submachinegun if they fire a pistol cartridge, and others may not. This question doesn't exist with the AKS-74U alone - Heckler & Koch classify the HK53 as a submachinegun, as well, whereas manufacturers of other comparable weapons (say, for example, the La France M16K) consider their products to be rifles. But such weapons do fulfill roles of submachineguns, so it's very plausible to consider them such.
Thompson submachine gun was created in 1919.
ak74u
about $15
Best known was the STEN gun.
uzi submachine gun
You get more maximum ammo when you upgrade the gun. The ak74u usually has 20 ammo, and gets 40 when its upgraded.
m14 or mp5k ,ak47,ak74u, famas,galil,and/or AUG
No, The P90 is a Belgian designed submachine gun.
Sten submachine gun
Sten (British submachine gun).
Assault rifle
Costco.