I actually drew the guns in the game! All of the weapons are comprised of different parts and have different little sprites. So there is no definitive single sprite for every gun, rather, for each tiny piece on the gun itself. Not sure if that'd be entirely helpful to you, that being said.
That's a very nice system and a good way to build up your guns. I'm looking for inspiration and drawing them myself would end up looking like bananas... xD May I use your building blocks to create my own guns then? :-) Would be a real help to me, I'm just as a starving coder as you said, and have to rely on the free game art that is out in this world! :P Thanks anyway!