You can send your friends common weapon XP cards through the Friends tab.
- Tap the two-person icon at the top of the main screen.
- Tap the XP icon on a friend's listing to send them a common weapon XP card.
Common weapon XP cards can be collected in the gift section of your mailbox.
- Tap the envelope icon at the top of the screen.
- Tap the gift tab to collect your common weapon XP cards.