We had a 12 Bore REVOLVER marked "Manville Gas" and a slew of those 12 bore brass gas shells. Gun looked as if were made of Bakelite. I made the mistake at about 12 years of age of shooting it into a chickenhouse (no chickens).When I got done crying from the gas, I got to start all over again, when my Mom whipped my butt. Something to do with her cats being in the chicken house.