How do I get more Armor Piercing Rounds?

When you have zero Armor Piercing Rounds left you will notice that the icon to activate Armor Piercing Rounds will no longer display the amount that you have left and this will change to a Plus (+) symbol. Simply tap on the Armor Piercing Rounds button and you will be shown a pop-up menu that will allow you to purchase more Armor Piercing Rounds for in-game currency.

Alternatively, you can purchase more Armor Piercing Rounds from the main menu by tapping on the Cart button located in the top right-hand corner of the main menu.