During the process of developing the pistol which would become the German army's P38, the Walther company was also interested in potential export contracts (like the one they actually did get from Sweden). One potential contract briefly explored was to the United States, and a few prototype MP pistols were made in .45 ACP caliber. These were larger in all dimensions than the standard MP, and shared the features of those other developmental guns (most distinctively the shrouded hammer and internal extractor). This pistol was almost certainly taken as a souvenir form the Walther plant in 1945 by an American GI. No records exist of any American trials of the guns, and it seems that the plan to offer them for sale was never followed through on, probably because of the (9mm) guns' success in German military trials.