This Instructable will show you how to make a spud gun unlike any other before it; rather than using compressed air or combustion, it uses pressurized CO2 created by a chemical reaction to propel the projectile. This project is a very simple build, but it will require a bit of math and some chemistry.
Step 1: Materials
Note: you can use any size of PVC parts for this project. I just used 1/2" because it was available.