The attached pic and linked pdf are my initial thoughts on 'generic' firearms.
I tend to lean towards simplicity in dealing with firearms. These rules are not meant to reflect any reality, they are based off my personal thoughts as GM, as modified by looking at the weapons table in the Dragon Age book.
They have NOT been playtested yet, so they may or may not work well. If you give them a try, please give me some feedback about how well (or poorly) they may have worked for you, and don't hesitate to make suggestions for improvements.
(a smaller, forum sized image is behind the break)