I had a friend that actually made it home from Vietnam War who was lead man for his group that carried a 12 gunge Winchester sawed off, but legal by fractions . That came home with him in his duffel bag. It has F Charlie and five slash marks. It killed lots of monkeys as it was shot on sound not sight, most of these guys did not come home as they where human bait.  His parents gave it to me when he checked out from agent orange. This is history kids in school are missing.