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I'm not actively pursuing it, but once I have gold with a couple guns in a class I will.
I have at least a class from every gun type, and I play them as I want. The only gold camo I have is the Type 25, but I am 2-6 challenges away on quite a few other guns (Vector, 870, FHJ, DSR-50, SCAR). I don't play one gun on every map or game type, I like to mix it up and try new classes, so it is hard to go for gold or even diamond when I'm not sticking to one thing.