I've got an M1-c papered through cmp, though I have been advised it is a greek return. Knowing most C's have all been rebuilt at some point, I know I cant get exact parts but maybe period correct parts. Is there any known source for this or shops that specialize in this restoration? I have an M40A1 in return stock and an M40A3 in a return stock and would like this to complete my collection. Jeff