How do I upgrade my weapon?

To upgrade your currently equipped weapon, please follow these steps:

• On the Weapon screen, tap the “Upgrade” button at the bottom-right corner of the screen
• You will then be presented with different weapon parts that can be upgraded, such as:
• Suppressor (In Missions, if you shoot and hit scenery, it will not alert anyone)
• Barrel
• Ammunition
• Body
• Stock
• Clip
• Sight
• Tap on the weapon part that you wish to upgrade.
• You will then be shown the details of the following upgrade for that part. On the right, you will be shown the effects of the upgrades should you choose to purchase them, these values will be shown in green. In the bottom-right corner, you will be given the option of purchasing the upgrade using Cash or Gold.
• When upgrading using Cash, you usually have to wait a certain time period before the upgrade is complete, but many of the earlier weapons will allow an instant upgrade. The time for the upgrade to complete will be shown just above the Cash button. 
• If you choose to upgrade using Gold, the upgrade will always complete instantly.