While many countries had interesting experimental weapons programs during World War II, none has attracted as much attention as Germany’s. Out of German experimental work came the first truly successful assault rifle, the StG44 and also the seeds of the roller locking system that would go on to be used in a wide variety of very successful weapons.
At the moment, we only have one German WWII weapon in the Vault, the MkB 42(W). More are coming, though.