Shame that some of them are held back by their terrible perks.
It should take 20 marks per roll (or 1 commodation w/e) and you unlock it at faction lv4.
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#Destiny
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But then everyone would have perfect vanqishers, and secret handshakes an plug.1s etc etc... I was lucky enough to get a vanquisher with fitted stock and glass half full from my NM rep rank up. It wouldn't be so fun if everyone had the exact same if not similar rifle I had.