Here's a tip, you can redo the house of wolves quest for 500 or so rep. You get it from the abandoned quest kiosk
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Yea I already did that I've done the story again and all of the quests on three characters and still haven't got the gun and on 2 of my characters in lvl 3
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Wait for next daily reset and go to Petra, I did the quest but didn't get the rifle till next day.