Just to let you know, I found a copy of "Kriegsmodell" Volume III (2012 revised ed.) on E-Bay, the seller also has a store there. So there ARE a few copies left floating around. I looked for MONTHS. But if you are still looking for one, check E-Bay. You might have to PAY, but it's worth it. Easily the best WWII firearms study I've ever seen. Hell, best FIREARMS RESEARCH I've ever seen. The authors and contributors have produced a fantastic book here.
Having said that, I will now be unavailable for the next 6 weeks as I will be reading and hopefully learning!