When purchasing certain Crates, you may find different Weapon Upgrade Tokens. These items are used in place of Bucks and Gold when upgrading Weapon parts to different levels. When you find a Token, your next Buck or Gold Upgrade on a Weapon within that type (Sniper Rifle, Assault Rifle, Machine Gun, or Shot Gun) will be free:
- Tap on the Weapon you want to Upgrade.
- Tap the 'Upgrade' button.
- You can see the number of Upgrade Tokens you have for that particular Weapon type.
Please note that you may still have to wait for the Weapon parts delivery time depending on the Upgrade level.
These are one-time use items that do not upgrade all of your Weapons in that particular class, nor provide any permanent bonuses. They're simply used to get a free part Upgrade. They cannot be used on a Weapon that is already upgraded to the maximum level.