If you level up during a multiplayer game DO NOT leave until the game has ended!
Although levelling can happen during the game, any unlocks from doing so are not credited until the game is finished.
Well at least that's what I think.
Now I've lost all my weapon unlocks and thus can't use the weapons WHICH I PAID FOR. Same thing with 5 of the dog tags in the "mystery" section.

(oh and by the way I seem to have too many suit module unlocks, wtf?)

I got extra 6 ticket weapon addon unlock for my scar=\ is that possible use on another weapon in the future?

You can unlock the scar attachments with those

For me the only weapons I can use in a custom class are the Scar or X43 Mike... svcks doesn't it

I mean those are extra mean i fully unlocked my scar lol