Best way go earn GP WITHOUT breaking a gun?

Title says it all. I only have 1 weapon set, and I don't plan on breaking it all (M4 Custom and Deagle). So basically I need tips on which modes give out the most GP; I think TDM gives the most time-wise. Any ideas?

Oh and also, I have enough coupons to get an MP5 adv. for 90 days, so I was wondering if I should break that...seems like a waste of coupons to me though.

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