I've been using the vendor version in Iron Banner and the thing is a beast. It has impeccable range for an Auto Rifle and with a steady hand you can chain headshots well into mid-range. The Suros scanner scope also helps a lot in finding and identifying targets. Maybe it's just the perks that are making it so good, but since this is already the vendor version that shouldn't be a problem.
It'll only get better with the next update.
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Nobody talks about it because the Zarinaea is so much better