So...
I hope it won't be thought too presumptuous of me, but I had some time and was looking around for something potentially useful to do. I thought I'd try and stylize the sine gun a bit:

Link: http://img404.imageshack.us/img404/2734/amsinegun.png

I tried to round things out and generally make it more cartoon-ish. The only absolute changes I made were to give the lights a little fade-out effect and to add some slightly darker material to the, er, grey barrel bit. Any thoughts?

EDIT: oops. just compared it in game and I completely lost the spinning barrel effect. That'll teach me to only compare frame-by-frame. Also, when facing left, since the animation is played in reverse, the fade out doesn't look so nice, so that doesn't work. I will try to fix these...