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This is what has to change my scenario ..... flak emerged in very good condition and a hidden deposit entrenu by partisan, etc ... or it was stolen from a military museum, etc ...
We must not forget that during the war of Yugoslavia fixtures with assorted weapons of WWII were used
You should still change the gun. That excuse doesn't work. The weapons used in Yugoslavia were not old museum pieces. They were weapons that were still in service when the war broke out.
I know this is a what-if build, but I would still keep it plausible. The right side gunner's seat is way too tall too. If you were sitting in the chair, the gunner wouldn't be able to have his feet on the floor. That would make it difficult for him to steady himself against the recoil of the gun.