There are idling animations. They just take forever to occur and aren't nearly as interesting as the ones you came up with. Usually its just spinning or flipping your gun. I've only seen the hand cannon one though, so I'm not sure what the others are.
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Wait what?
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I don't think it works in the tower, but if you're in a stage, like on patrol or something, you character will twirl or flip the gun you're holding. It only works of you're in first person mode, won't work if you leave your guarding sitting.
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You mean holstering it?