Low repair costs?

I have an AK and I just noticed that the repair costs were so high I couldn't make any GP. :( I was planning on saving up for an AWM but that doesn't seem to be happening anytime soon... Well now what I'm looking for is a good gun with low enough repair costs to make money (I don't want to play E.M. or knife/pistol, I need a primary :D) Can you guys suggest a good gun (preferably an SMG) that I can have fun with? I'm staff sergeant 2 right now with 40k gp.

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