MMMM, the standard C.A.R. and just for the sound when its fired, the Chinese Pistol. It may svck like a hoker at a lonely man convention damage wise, but dear god does it sound bad ass.
@Chriso- You could always just use the Magnum from Mothercraft Zeta on the cowboy.
[censored] Mothership Zeta -- that [censored] does not deserve to be on the great Chriso's Xbox! It will be a plague on my hard drive.
Seriously, though, thanks for the suggestion, but I'm not paying 800 MS for it.