Could someone explain the need for more vault space? Are you keeping rare guns? Or do you have three of every legendary? I have no need for vault space. If I do not use a gun I dismantle it. I see no reason to keep things you do not use. There is more than enough storage space in the game.
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I don't have any doubles and I barely have room for one gun. All but three exotic, one of each vault weapons, and CE weapons doesn't leave room for anything