Ok, thank you for that clarification. First, of course, make the game overlay button. Next, go to settings and turn off infinite refills. Finally, wire the overlay device to a checker, with the settings: when button pressed → run check. The check should see if the amount of ammo is greater than 0. Wire the checker to an item granter that grants ammo. The wire should be: if check fails → grant item. That’s it! (Sorry for taking so long I was typing a different way when I thought of this one).