colored guns in soldier front?

Does any one know how to change your guns colors? plz help me?

Edit the .rez files. As to where that is, im not sure.

Well in the .rez files, search for the gun you have, And it has all the variables, coloures, etc. And change them to what you want. And then save and then go onto soldier front and done. And if you want upload them to Mpgh, so you can get some credit and stuff.