Dark Lockgun 25h on my First Pw3 Box run.

So i wanted to attempt a box run on my new FOmar. I go in there and my flimsy shop mechs 45 hit are doing almost no damage. I finally manage to kill 3 enemies, and the third one drops this. It's been good times since. Hell, i can even do a hard mode box run with this.. I just can't get hit...