Random thoughts
"Knowledge is of two types, that which we know and that which we know how to find." Francis Bacon. Once information on how to do something is available it is a lot easier than starting from scratch.
Consider the Warsaw Ghetto - my guess is that there were few gunsmiths there yet they were making their own weapons.
PPSh41 barrels were often made by taking a rifle barrel that was worn out and cutting it in half to make two SMG barrels. Maybe there is a 7.62mmN answer in the years after the war.
I can see the possibility of an initial shortage, reducing as the tears go by as apprentices become fully trained.
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