There is no such thing as a "rare" weapon in this game you can obtain gally like all the other guns in the game this game is based on luck since it is a rng. And if they were rare I wouldn't have four gallys I am just pure lucky like everyone else who has gally.
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Agreed, had a streak of 7 hawkmoons in a row once, supposedly the most "rare" exotic hand cannon. It's just random luck, nothing else.