Mors wz.39 submachine gun (Mors is Latin for death, Polish for walrus) was developed by Polish small arms designers Piotr Wilniewczyc and Jan Skrzypinski between 1937 and 1939. After extensive trials against the German-made Erma EMP-35 submachine gun, the Mors was officially adopted for Polish service in 1939 and production was ordered to the Fabryka Karabinów rifle factory. Only about 40 Mors submachine guns were built before German army attacked the Poland in September of 1939, and all but two or three were lost in combat or destroyed by Polish soldiers to avoid possibility of the guns being captured by Germans. production of the Mors submachine guns was ceased shortly before German occupation of the factory, and all manufacturing plans were either destroyed or smuggled out of the country, out of the Nazi's reach. Because of the overly complex design, which was quite expensive to manufacture, production of the Mors submachine guns was never resumed after the war.
Ingame, this SMG shows normal perfomance but has a bit slow reload.