Gun Droooooooone!
Sounds like you should give Traps a try.
Does the gun drone actually follow you, or does it just stand there?
You're looking for a Bots/Trap Mastermind I think. If you only play Blue you could wait for going rogue, but if you want an overpowered techno lightshow of forcefields, lasers, acid morters, seker drones, flamethrowers, and poison gas, to go with your caltrops and trip mines, that's what you're lookin' for.
Is it just mine that has the Leroy Jenkin's disposition?
After playing some Global Agenda, and seeing the awesomeness of the Robotic's Class turrets and drones I decided to check out Gun Drone here on CoH.
I don't think I've really played it after the whole "gone mobile" buff, but today I checked it out and after shooting it simply barreled at the enemy. It was funny considering it barreled down on a Bane who whipped out his Mace and smacked it's -20% Smashing Resist face out of the park. Genius.
On an unrelated note, playing Robotics there really makes me sad looking at Devices here. Caltrops and Web Grenades versus moar Drones/Turrets and Power/Medical Stations.