Nope. The STG-44 recoil spring is in the stock and has an entirely different system. It's possible he got inspiration from the intermediate cartridge and select fire, but the Kalashnikov is an entirely different gun
STG-44 and the AK-47 look very similiar.
Plus, the Soviets are infamous for copying ideas.
Now stop being a commie and admit the fact he just copied the idea.