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@vabeachguy
While you’re using him, you can use his primary weapon the way you normally do with any Transformer, by touching the screen in the place where you want to shoot.
But if you look in the lower right corner of the screen, you’ll see a little icon. Tap that to fire the secondary weapon. It takes several seconds to re-charge, before you can use it again but you can still use your primary weapon while it’s re-charging.