Above to your top right you can see the Pin Spring. This spring serves a very simple purpose. It is put their to keep the firing pin in place, nothing more and nothing less. In your bottom right you can see the firing pin we made. This part is what keeps the rubberband in place. When the firing hammer hit's the end of this piece it creates an angular acceleration which causes the other end of the pin to lift thus firing the rubberband. To the top right you can see the Barrel Loading spring. To go back to the assembly view click on the cad button.