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Are there any faster ways of getting gold guns other than just killing and completing challenges? Is any one game mode better than the other? Right now I'm halfway through level 30 for the Gold Striker but then I want to get the Gold Spas-12 the striker took me a while compared to the Gold UMP. Basically what I'm asking is, are there any tips for getting gold guns faster?
I've seen videos on youtube that say that when you play S&

you get 500xp per kill to your weapon, is this true?