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Got it once and received a legendary assault rifle. Think it was a lv 48 verruc. I was incredibly chuffed due too the fact that I had spent days trying to get the challenge for 3 vault symbols or 3 iridium bars, was having the worst luck that I even ran out of money so a friend gave me a few mil to keep playing lol.
Since then I decided to farm for a lv 50 version of the verruc.........to this day it hasn't dropped!