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It is a safety issue with SASS! If you go to the SASS Rule book on the internet, it stipulates that all guns must be carried in a safe manner, as such revolvers must carried with the hammer down on an empty chamber. It would mean that a revolver with only 5 chambers would only be allowed to be loaded with 4 rounds. It would mean that you would have to load a additionnal round in order to finnish a stage.