So a tip of the hat to Hugo Schmeisser, one of the most accomplished firearms designers in history, who was released by the Soviets in 1952 and who died on September 12, 1953.
Look at a Remington model 8 especially from the right side.
I have little doubt that the designer(s) of the AK had seen one. Of course the Remington is recoil operated but then Browning, who designed the model 8, also invented gas operation.