i have corrosion version of one and notice it does not do as much damage then my rifles i have use the most. also every time i tried to farm for Skullmasher all his drops fall threw floor or fall to place where i can not get to since he dies to far to land in middle of area.
right now i use this
and when i really want to sniper from good spot that not in second dlc i use this. since do not have to watch out from all sides in fight.
here my railer