Approx. 250.000 MP44 were made. The STG 45 Volks Strumghewer was also made in 7.92mm Kruz. No other country built guns for it that I'm aware of. It was used after WWII by Yugoslavia, Syria and some south African countries until enough SKS and AK-47s became availible.
CD
ETA: We did have an older MP43/I model in my units arms room from 1986-92'. Don't remember a magazine and I even hunted down 10 rds of ammo for it to shoot. Got the gun back out of the foreign weapons locker and then noticed that it was demilled (barrel plugged and bolt face welded). Would be interesting to have a barrel chambered for it in my Contender.