To unlock the Just Cause rifle:
- Complete mission 4 in Montenegro.
- From the main menu, tap on the Just Cause rifle menu at the top of the screen to view the unlock requirements.
1- WATCH: Tap the watch button to view 3 advertisements.
2 - PLAY & REACH: Tap the PLAY button to play Montenegro missions until you have attained Rank 3
3- ADD: Tap the ADD button to add one friend.