Thanks. Something may break and we find out he was fooling
around. I’d hate to think that was the case, a life being
lost like that.
The propmaster is responsible for the safety of firearms used on set. Actors, and people in general, don't know much about firearms. They should be kept under lock and key, except when they are being used.
There are numerous examples when it went wrong. In 1984, actor Jon-Erik Hexum took a .44 loaded with wadded blacks and put it to his temple and pulled the trigger. He had no idea that at that range it could kill him. To me, the propmaster never should have allowed that to happen. All actors should be warned about this, and firearms should be in the custody of a prop person when there is no film rolling.
Bruce Lee's son Brandon Lee was killed during a movie scene because of improper dummy rounds with too much primer.