Actually, I do remember to have read an interview with Mikhail Kalashnikov years ago where he said that, in WW2, his platoon had been decimated somewhere in Belarus in a battle against German troops armed with STG44. He affirmed that, once he saw how the less than reliable Russian rifles couldn't fire due to the mud and water, he decided to create an assault rifle to ensure that such a slaughter couldn't happen again.
As a result, the AK-47. He admitted that the German design for the STG44 was so good that forcefully he needed to adopt a similar solution.