This junker is a beast or this beast is a junker? What side of the fence are you on? I just got it yesterday and havent upgraded it yet, but im leaning toward this beast is a junker... unless you really enjoy pvp then maybe its a beast...
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I use it a lot for a very specific loadout in PvP, Warlock blink shotgun. Even if this isn't your thing, I'd advise upgrading it to the top perk before sharding it.