The weapon was op, that stands, but now it's really bad, it still deals decent damage and slows zombies down, but it is a 275k$ 180 lvl gun and it's almost impossible to take a kill with it because it does 55 dmg per tick, by the time zombies get to 55hp, some other weapon will take the kill.
The best balance for the gun would be limiting it, but since it can't be done reducing its damage 6 times what it was is too much.
So my suggestion is to buff the damage to 180 at least. In the current state, i don't see a reason why would anyone want to use it compared to the rod, which costs less and requires a lower level