Alright so my players have realized that at level 5 Gun training and pistol training are not traded and so not only do they gain both, but are also stacked...
SOMEONE PLEASE TELL ME THEY ARE WRONG< OR ITS BEEN ERRTAED OR SOMETHING I HAVE A GUNSLINGING GOBLIN DOING 1d6+18...
looks like a mistake. pistol training should replace gun training. this must have missed the errata. They'll get it eventually. A goblin with 1d6+9 damage is still scary.
Look at Musket Training in Musket Master. It's worded almost identically and it does replace gun training. That Pistol Training doesn't is a pretty clear oversight. Besides, it sounds like you're the GM. You can make whatever ruling you want.
Goblins with guns doing d6+18 damage sounds about right to me. It's goblins with guns doing no more damage than goblins with crossbows that sounds nuts to me.
Note the 'imo' in my post. I realize many gamers are sadly mistaken about guns in fantasy. I don't waste time trying to convert them to gunless games any more than I'd try to convert them in a religious sense.