Going for ak knife and m4-custom

Is this a good idea? I have 20 coupons, 85kGP and ZP for 40 crates. I want to: Get ak-knife crates and with the GP i get+the 85kGP, spend it on GP crates. Coupons should come to around a total of 60 giving me m4-c. Is that a good idea? I think it is since I am guaranteed an m4-c and a chance at ak-knife. Give me your opinion on another alternate solution.

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