in the garage - I go to tune and there are no guns. am I missing something???? I could really use the rocket launcher!!!! I can not buy it ether..........

When you're in the Cuprino, mousewheel down (or up) to switch weapon systems. That works for any car, actually.

The Cuprino lets you use both, so there's no need to equip one or the other. Just switch back and forth while you're driving.