Got annihilated by one guy in crucible with black talon. The power ammo Regen perk kept him full of ammo and he multikilled our team several times. He had an efficiency of 16 k/d.
Edit: Nevermind. Guess it doesn't matter.
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It gains ammo on kill with the requirement being that you have to get a brick of Heavy in the first place. So we have something that's completely outclassed by rockets, Tractor Cannon, and hell I'd argue that each engagement against a sword is a toss-up at worst with normal shotties and fusions. And you want it nerfed, no, don't control power ammo, don't try to get the sword into a bad position, just cry because it has more longevity than 5-10 seconds. You have summoned me.