We have for sale reproduction German WW2 MP40 Magazine adapters to convert Russian PPSH 41s to accept MP40 Magazines. These adapters are reproductions of the adapters used by the German military during WW2 to convert PPsh41s to MP41Rs. May require some hand fitting & filing to function 100% properly. Check out the video below by Ian McCollum with Forgotten Weapons regarding the MP41r conversion!