Thorn only needs a bigger mag (maybe up to 8 shots) and faster reload speeds, other than that, the damage is great. And stability needs no change, because of it obviously being a handcannon.
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I think the problem with it is that even with the dot, due to its small ammo size and high recoil, it can't even come close to the DPS of a legendary like The Devil You Know, with its far more manageable recoil, faster reload and 12 round magazine