"At the same time, many properties of the german model got incorporated into its development, which accelerated the whole process significantly. Yet, the breech locking system with its rotating head is an entirely different solution than in the german Sturmgewehr."
I would like to know where you got that. Many design features of both weapons were made from information already available to gun designers since the beginning of the century, and developed further from World War I. What are these "properties?"
As I said, coming from someone who has spent time with both, the few things that are similar were well known to firearms manufacturers long before either were made and owe those principals to other firearms manufacturer's of the time.
To note, the STG-44 was stamped steel, had a tilting bolt design similar in ways to the later developed STG-58 or FAL as it is more commonly known.
The original AK-47 on the other hand was a milled steel receiver with a gas operated piston with rotating bolt design.
These two designs lend themselves to two COMPLETELY different ways to build a firearm, and represent the largest difference in the internal parts, and how and where they are positioned and to their function. There is almost nothing in common with these weapons except the shape of the magazine, which curved magazines were NOT new and the fact they used a shorter standard rifle round, which was determined in Russia less by the manufacturer themselves and based heavily on the requirements that the government deemed necessary at the time.
To put it simply, the AK-47 has more in common with an M1 Garand than the STG-44 as far as function and design, not only in the design of the original receiver (yes, original AK-47s were milled from a solid billet of steel, whereas the later AKM was stamped), the way the bolt functions, rotates and locks.
About the T-50, sadly I don't have much more to say.
