Scar VS K2

I have a K2 with deagle and a amv sniper. I used the scar a couple of times which I did good with.

So my question is that
Scar light vs heavy which one is better
and the winner of that vs k2

I have only 2500 gp and need a way to raise my gp without repairing my gun gp. What modes do not use gun repair gp?

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