I looked at this topic and thought it was awesome, so it got me thinking, if I were to use bottle rockets for ammo for the SPNKR, which would fly straight and explode! Obviously if I make this I will have to take multiple things into consideration. For instance, pvc will have to be used for straigh trajectory, and I could only fire it straight in the air, because frankly it is an explosive and could hurt someone, and how to make it fire. Well, I am a pyro so I know a thing or two about explosives. Instead of lighting outside the tubes which is dangerous because of fuse length, I would dissasemble a lighter, one of those long ones used for grill lighting, you know what im talking about, the one with the "barrel" and keep the fuel in a separate part of the launcher due to explosions not wanted. So I would take the barrel and attach it to the pvc with the rocket which would be loaded from the front of the launcher. There would be 2 lighters so I can fire either when I want. Sounds pretty good, I guess I just have to look into designs now!