Why not just put some of the weapons on your characters? In other words, use your character weapon slots to store guns. Also, if you're going to dismantle anything then dismantle one of the duplicates. I doubt Bungie is ever going to allow trading but even if they do I'm sure by then everyone will have almost every exotic thanks to Xur
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My other char. has pretty good weapons. :( I'm actually not even sure why I hoarded them. I guess I could use the energy. :)