If you were in a zombie apocalypse which exotic weapon would you bring with you? You can only choose one!
I would personally bring the icebreaker as i could just sit on a rooftop and snipe tons of zombies with infinite ammo.
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Probably Icebreaker, not just for infinite ammo, but because every kill causes the target to explode, not even needing headshots, which makes it better than any gun with Firefly. Zombies love to hoard, kill em' all with a full clip or less!