A buddy and I are doing the daily heroic; juggler is on, and he is using Ice Breaker.
No ammo dropped the entire run for me, and ironically, only special ammo was dropping for him while using Ice Breaker.
I was sad.
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I feel like juggler is on anytime that I am playing. I rarely get ammo drops; even when I'm killing 2-3 times more than my fireteam members.