How to Get New Items in "Call of Duty 4"
- 1). Select "Multiplayer" from the main menu and then "Xbox Live" or the PlayStation 3 equivalent.
- 2). Begin any type of multiplayer match. Play through the match and gain as many experience points as possible. Notifications appear at the end of the match if any new items are gained.
- 3). Select "Create a Class" and then any "Custom Slot" after the multiplayer match is finished to check out the new items available. Equip the new items here in order to use them in future multiplayer matches.
Source...