For this you will need various PVC pipe and cements. I will have to warn you this will shoot far so be carefull.
This is a lot of fun just make Shure that you are at a farm or open field to shoot this
warning: this is dangerous so take caution if you build this.
Disclaimer: if you get hurt in the process of making or firing this device it is not my responsibility.
This can be illegal in your state so make sure to check your state's laws before building .
Step 1: Tools and Supply's
4" PVC clean out plug
4" PVC fitting clean out adapter.
4" PVC coupling
4" by 24" PVC pipe
2" by 4" PVC increase reducer
2" by 4" PVC pipe
PVC cleaner primer& cement
. Hair spray ( flammable kind)
Tools: hack saw (or cut off saw) file.
Make sure that you have pressure rated PVC pipe not bubble core That will explode use schedule 40 pipe you can find at your local Hardware store
Step 2: Assemble
1.take all he supply's outside and get the primer ready
2.prime all the ends of the tube except the top of the barrel
3.Once you have done that it's time to glue now
4. glue the back screw cap adapter first and tip it facing down so the glue doesn't drip on the threads.
5. Glue all the rest of the parts you primed and make sure to glop the glue on so it seals tight.