It can 3 shot headshot low armor enemies with Agressive Ballistics, but that's really it(other than the armor and agility perk). I do want to try it, but I don't have a fire team to help me on the quest line
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so can Cocytus, w/out giving up an exotic slot. AND you may get another useful perk like grendier or something instead of Proc based agility perk
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But Cocytus is slowe RoF