I havn't used Gunslinger in PvE since ttk droped, but from what i remember it was a very good class. I don't really think the gun needs more damage. But i will say the two non-trip mine grenades need a buff. Theres a reason no one uses anything but tripmine, and thats becuase tripmines is the only one that can actually get a kill without wearing an enemy down to at least half health first