Because Germany didn't have a fleet in WW1. Ok well it did but it may as well didn't. That's sorta the joke. And also cause Germany had run out of steel and couldn't build anymore guns. Or if they had put one on a ship, they didn't have enough fuel for the ship. >>2506
It's really not, in fact the AK was mostly done by the time the Soviets got their first captured Stg. The AK started in 1944 and was more about having something that was a cross between a PPSh and SKS instead of having an SMG and semi-auto rifle respectively, whereas the Germans dusted off plans from some intermediate-rifle cartridge from the 1920s for the Stg and didn't really know what the wanted as the Stg didn't really fill any roles and was more just the Germans getting high off mid-war Euphoria and making really cool stuff that's ultimately useless and since it started development around 1941 it didn't show up until 1944 and by then they didn't even have enough steel for bolt-action rifles let alone making a new weapon nobody knew how to use. The Soviets just wanted the AK cause they wanted a semi-auto rifle that could fire on full auto indoors, Kalashnikov himself stated that many times and stuff like the gas operation show why although they're aesthetically similar, mechanically they're about as different as you can get.