In all honesty, there is no established standard. But the de facto rule seems to be as follows:
(1.) If it's a movie that doesn't have too many types of guns (say, 10-12), the listing is chronological.
(2.) If it's a movie/TV show with many types of weapons (over 20), then we tend to use categories of weapons.
(3.) If it's a TV show, it's arranged by Season, then chronological (see our "24" page, for instance).
(4.) If it's a TV show that has featured HUNDREDS of weapons, each season gets its own page, then the weapons are listed categorically ("Miami Vice" being the classic example here).
Hope that helps. But personally, I don't care too much. I mostly care about the format of the individual gun entries (i.e. gun photos and page links, correct spelling of the gun name, no link in the heading, etc.)
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