This is a step by step video tutorial which shows you how to make a homemade potato gun! The parts needed are: PVC pipe 3" x 2", PVC pipe 2" x 2", converter coupling 3" x 2", end cap 3", coupling 3" to 2", PVC abs cement, and 1 BBQ igniter. Apply PVC abs cement generously over and inside all the pipes and couplings. Make sure all the pipes fit together firmly, if not it will explode when you use it! After the pipes are cemented, drill two holes for the igniter. Run the igniter wires inside of the gun. After it is set, leave to dry for 24 hours. Have fun and be careful!