More than likely the best party hat in the game atm, only 24 slots but
look at that base damage and hero attack
This is the giant assault rifle gun. I haven't seen enough of these weapons advertised to judge if it's the current best, but I do know it's better than the one I'm using atm, I'm just too lazy to upgrade it myself when I do fine with what I have. The max speed is 10, so you'll have to spend 1 point to upgrade that. It also gives 13 to hero attack and 17 to piercing shot. It does have a negative stat, but that's invisibility, and no one really gives a shit about invisibility.
Taking offers, but neither of these is going cheap. I'm out of mana currently, won't be restocked until tonight.