BF4 DLC weapons re-locked (Error)

On which platform are you playing?  Are you able to play any of the maps from the expansion packs that the DLC weapons come from?  If you are not able to play the maps please repair your BF4 installation in Origin (if on PC) by right clicking the BF4 icon in your games library and selecting "repair".  After the repair is done please try to play the expansion again and try to select the weapon.

If you are on console re-download and reinstall the expansion packs that contain the missing "relocked" weapons.  This should allow you to play the expansion maps and use the expansion weapons.

One additional thing, if you are on PC and you are being asked to purchase the expansion packs when you have already purchased and installed the expansion packs many players have found this solution to work from eanils http://answers.ea.com/t5/Battlefield-4/BF4-PC-China-Rising-DLC-Problem/m-p/2017595#U2017595

Please first make a backup copy of your registry as described here: http://windows.microsoft.com/en-us/windows/back-up-registry#1TC=windows-7

Next check out these steps below:

1. Log out and fully exit Origin
2. Open your Registry Editor - Type in regedit on the Start Menu Search field and press Enter
3. Navigate through HKEY_LOCAL_MACHINE > SOFTWARE > Wow6432Node > EA Games > Battlefield 4
4. Check if there is a folder named Xpack1 under Battlefield 4
If YES -> Click on Xpack1, on the right pane check if there is a string named Installed, the Value data should be True
If NO - right-click on Battlefield 4 > New > Key
- a new folder will be created, name it Xpack1
- right-click on Xpack1 > New > String Value > name it Installed
- on the right-pane, double-click on Installed, set Value Data to True
5. Exit Registry Editor
6. Log in to Origin and Join China Rising Maps

(Do the above and replace with the following for each DLC if needed)

Xpack0 = Second Assault
Xpack1= China Rising

Xpack2=Dragon's Teeth