Newly Bought Guns don't show up...

Ok, so I went and bought a ton of new guns in the In-Game shop. I equip all of them into my bags and join a game. When the game opens, i immediately get a client error and for some reason i have no primary. That, or a random M4A1 shows up instead of my gun. Can someone please explain this and maybe provide an explanation? BTW: the bags show that i have the guns, its only when im playing a game that it dosnt show. Thxs in advance!