- 1 decade agoFavorite Answer
Single action revolvers are what you see in the old western movies. The hammer must be "******" rearward to be fired. Double action means that if you pull the trigger, it will cock the hammer back, and allow it to fall forward as you pull the trigger. A double action revolver also has a cylinder that folds out the side, allowing mutiple rounds to be loaded at a time. where as a single action must be loaded one round at a time.