Haha, to be honestly I don’t actually recall why I specifically noted the revolver as being vacuum proof, except possibly as just a way to add a bit of flair to the description. It’s possible I was trying to nod towards some specific sci-fi reference, as all the starting character packages started off as a reference towards something, but things have gone through so many revisions by this point I can’t actually remember.
In any case, this could totally be replaced with something more interesting and evocative. I’ll throw it on my “things to fix” list.