Listen I really don't know how is this process of entertaining new guns and bow in game coming, but i will give you an advice. I know you're probably bored of lots of people's advices of new guns etc. You see, I looked at plans about making a Volcano gun and here is great example:http://www.youtube.com/watch?v=TLdfNCAuW0Y&feature=relmfu It's from an chapter in a game of Call of Juarez: Bound in Blood. You can see that guy is holding Supreme Volcano gun in his right hand. It has 12 bullets and it shots very very fast.
Hope it can help you!