Most single actions have a safety feature that prevents firing pin from resting against the primer unless the hammer has been locked back AND the trigger is pressed. For instance, if the hammer lock failed, but I did not press the trigger, the hammer would slam forward but it would not hit the primer. Pressing the trigger engages a transfer bar that allows the energy from the hammer to be deliver to the primer. Without the trigger press, no bang.
Yeah, that's how my CZ and HK pistols are, but what about antiques like a Colt single action army?
Beside the point, as they are not using antiques on set, but rather replicas which have modern safety features like I mentioned.
According to Colt SAA wiki;
>Starting in 1999, Colt began manufacturing a version of the Single Action Army revolver with a modern transfer bar safety, allowing it to be carried with the hammer resting on a loaded chamber.
So, it is plausible.
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