Money making help?

Well i really want 2 weapons,
The AK-47 and M4A1 And i've used most of my cash on scar heavy and crates,
Is there a way i could get around 80k or something?
Thanks if someone helps,
And please don't put comments like
Just get one or something because they're my favourite guns until i get the M4A1 Custom Crystal DX

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