That is a fascinating firearm and it bothers me not a bit to have in my collection arms that may have modified post war. I like my weapons to show that they were actually used. In your case, I am not sure that it was altered post war. If I were assigned to drive a supply wagon during the war, that arm, with a flared muzzle and cut down length,would be the perfect gun to store under my seat for things "that go bump in the night". If I saw that arm at a show I just might have paid $600 for it. On the wall in a den, I'll bet it would be the first thing a visitor noted and asked about. You have a good eye for the collectable.