Disappointed as fck, this 'legendary' auto rifle that I earned which also costed 150 vanguard marks is complete garbage, so a tip for everyone, DO NOT BUY DOCTOR NOPE!
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Once it's upgraded with stability perks it gets better. Still not great in pvp however. But in PvE the extra rounds keep your target flinching, and 72 rounds in the mag can make keeping your enemy's shields down easier if you pace your shots.