Question about MPGH CrossFire public hack

Hey guys, I'm having some trouble with the mpgh CrossFire public hack. First of all, most of the features are working fine, except for one; weapon hack. I'm not really sure how to work this in game, so if anyone could please fill me in, i would greatly appreciate it. I go to the menu, select AK47 Camo, and nothing happens. What do i do to get the weapon hack working? Thanks in advance to anyone who helps me! Peace out!