I have wondered this for a very long time, and haven't really seen a discussion on it.
Ice Breaker-- a [i]sniper rifle[/i] that recharges ammo and has no magazine.
Invective-- a [i]shotgun[/i] that generates reserve shells out of thin air.
This, to me, makes zero sense why there isn't a fusion like these other two exotics. These guns shoot [u]pure energy[/u]. They're "magazines" are actually [i]batteries[/i] (the extended mag perk for fusions is called [i]enhanced battery[/i]). Yet there isn't one that [u]charges its own energy[/u].
I propose, Bungie, that you consider this. I love fusions, and I've been wanting a cool-looking exotic one that has a "rechargeable battery". I don't think any exotics that have come up on YouTube, or the "make an exotic" threads have actually been put into the game. This however, is just giving a general idea to a legitimate question.
Edit: Most of you keep saying Pocket Infinite. While this gun did have Mulligan in its respective perk, it did not [b]recharge[/b] it's own ammo.
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This would be awesome