Re: lost bf3 dlc weapons

If the expansion packs are deleleted or corrupted or your Premium files is corrupted you can lose access to your expansion pack weapons.  In order to regain access I recommend to first re-download your premium file from your download history, if that doesn't work re-download the expansion packs that contain the mission weapons from your download history.  If you are on PS3 remember to manually install them once they download in the games section of the XMB.