Is there a guide for this? All there is on Dulfy is the Virulent Sniper build... Anywhere I can get the Gunslinger/Dirty Fighting utility build/rotation/gearing?

 

I wish there was an explanation for the mirror classes on what the utilities are and the abilities... If it's on Dulfy, I've yet to find it.

As far as I know there isn't one for Dirty Fighting yet, but the virulence one by veldix is a good place to start. If you look through your skills and compare them you should be able to make a list of the mirror skills and go from there.