Schwarzenegger-from-Predator is a simple Amish boy, building his muscles with barn-raising and buggy carpentry. When a chance encounter with a mysterious private military contractor leads to a new career, Arnie tries to keep his two lives separate. But nothing is secret…. from God.

I think they generally carried with an empty chamber under the hammer because the guns didn't have safties i.e. could have gone off if dropped or bumped. When cocked it would have rotated the next, loaded, chamber into place.