Coupon Help -.-

Well in the Black Market of Crossfire it saids Coupons....... WTH DO I DO WITH THEM?!?!?!?!?!?!?!?!
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I've seen on the Z8games Guide that has Golden Ak-47 and Ak-47 Knife it said 80 coupons permenate -.-

Yo Collect them then you can get a gun

Where do u get the gun from which website???