Grinding every gun to gold again and here's the order that hurt least. Do SMGs and ARs while you still have a soul - fast, forgiving challenges. Do Zombies rounds for the 'get X kills' bulk challenges, the horde doesn't fight back. Save launchers and the marksman long-range stuff for absolute last, when you're running on spite alone. Do NOT start with launchers, you'll quit the game and possibly your job.
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