Best way to save up GP?

heres the deal...
i bort the M4 after hearing it was a good gun, but it does not suit my playing style at all really.
so i have been saving up for a Steyr AUG but i have no luck because i will gain about 150 GP on a very good game but then i look at my gun and its like 300 GP to repair and i feel i'm getting nowhere.

so what is the best way to save up GP?
and how often do i acctually have repair my gun?

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