i got a sweet, made out of pvc, its got a 4 foot barel made out of 2inch pvc and the combustion chamber is made out of 3 inch pvc, then i glued a screw on pvc cap so you can open it and spray in hairspray then close it off and click the barbecue ignitor. make sure evrything is tightly glued, believe me they have power. Mine shoots a good 200 feet EASY and with alot of power, thats just with the gun pointed flat, if you tilt it up itl fly halph a kilomiter (did it at my lake and went into the middel of a small bay)