I have to 2nd RC for Gel Rounds myself, usable with any of the Ranged Weapon skills.
That said, some other favorites depending on alternate skill used...
UAC = Shock Gloves
Clubs = Stun Baton
Throwing = FlashBang Grenades.
Spellcasting = Clout, Blast, & StunBall (Or Fling using Flashbangs above.)
Summoning = Various Spirits using Binding, Engulf, &/or Confusion