I believe you are right and when I go looking for a Mil rifle I do a lot of research just like that to find out exaclty when they were made.
An obvious case is the Ariska mod99s I have of which were made before the war started compared to ones made during or at the end of the war that were known to have a lot of dangerous defects only because production was speeded up so fast.
Not sure how that went but I can just imagine those japanese being told to speed up production with some workers being taken out back and shot for not meeting quotas
That would sure affect production standards over there and in the US I bet they had to meet a quota also where some standards suffered as a way to keep up.
Thing like, "But these recievers didn't get heat treated yet"?? with someone telling them put those damn things in the cart so our department can make the quota this week.