Rogue: GunFollow

Can Rogues use guns with training or only bows?

You can most definitely use gun, and they are a fantastic soloing weapon. After investing points into Remorseless Attacks talents, I found that at level 44 I could crit a gun attack for well over 600 damage against lower armor targets, which tend to be the bread and butter of a soloing Rogue in WoW. I would say the only downside of Remorseless is the fact that you are on a 10 second timer, which can make it hard to solo higher level mobs.