Thats PPSh41 picture, seen it before.
Since its so easy otherwise, perhaps we should begin to wonder if its early or late model PPSh 41. (there was semi/automatic and automatic only 41's around.. I think late one was full auto only)
Lynx,
What problem there was to adapt it for 9mm?
Germans did that in large numbers for PPSh41's, for better ammo support.