ok if u want the sweetest potatoe gun heres wat u do: get a pvc pipe that is very thick and about 10" long. put a hole in the back and front and a tiny hole in the bottom (enough for a little flame to get in) and stick a bottle of WD40 in the back and a potato in the front and spray some WD40 while putting the match in the bottom. but im not goin to claim any responsibility if u get hurt. and ther is a huge chance ur going to get seriuosly hurt if u do it. another good way is tape an airsol can to the back and no hole fora match then stick the potato in the front and make sure that can is snug. remember. this is highly dangerous and im not gonna take any responsibility if u get hurt becuase ur doing this at ur own risk. my friend did the first thnig and blew his fingers off. be careful