XM8-Adv crates

Hi all, i really want xm8-adv, i need it i love it, but i havent got GP but i have near 30 weps, and all permanent (http://clan.z8games.com/charstat_cf.aspx?usn=4557509) and i need some GP for the crates, what u recommend to do?

And with ur opinion how many GP i get?

Ty!



EDIT: WITHOUT GETTING ZP!