Ping Pong Air Cannon

Well, this is my first post. I know its not much, but i have limited resources and time. this is in fact a ping pong cannon i created, which can shoot over 20 metres, perhaps more. the video shows what you will need(except i forgot to mention you will need a 40mm end cap), and it is a pretty simple assembly. it cost me about £5 which relates to about $7. enjoy and happy creating.