First off, this is about the original 20th Prime. Not the DVD edition with it's funky blue gun. I have heard around various forums on the web about 20th Prime's gun color variants. Namely the Grey gun and Black gun Variations. What I have been trying to find out with little success is which one is the rarer of the two. I figured with the mass of kowledge we have here someone is bound to know more about it than I have been able to dig up. So which is the harder to get? Black or Grey?