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One of the classic mistakes make by authors who are not "gunnies" is to have a character threateningly click off the safety catch...on a revolver (sound effects editors do it in movies and TV, too). Argh! That's not a thing!
Except that, well, it sometimes is a thing. The Webley-Fosbery automatic revolver is the best known example, in large part due to its appearance in "The Maltese Falcon", but there are lots of other examples of revolvers with manual safeties. Let's have a look at a few...