Chris, you might be best at talking to johnnyv on this forum, he is the most likely to be able to help you out. You say metal but do you mean steel as in an MGC or are you happy with a a zinc one, so marushin or nakata. metal MP40's do come up but not on a regular basis, have you tried gunbroker they have them on there on occasions. I am assuming no one has anything for sale at the moment and finding a pristine one is not easy due to age.