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What? No trope about guns not working in vacuum when they work perfectly well due to gunpowder, black or smokeless, containing both oxidizer and fuel? The episode of "Firefly", "Our Mrs. Reynolds", has this and a few other Guns DO Not Work That Way tropes. In literature, Ben Bova's "RED Planet" (set on a Soviet dominated Mars) has pistols encased in "gas jackets" so they'll work in vacuum or the thin atmosphere of Mars.
Well, feel free to put such a trope in YKTTW.
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