I don't believe so, unless you want to count the various "Volksturm" rifles that were made as a last-ditch effort at the end of the war; there were plenty of MP44/StG44s left at the end of the war to "temporarily" equip a lot of forces, but by the time those went out of service, everyone was already moving to 7.62x39mm, so there wouldn't really be any need for something in the 8mm Kurz chambering. A shame, really.