This is a really cool blow gun that can extend and retract. Easy to make using household items. It might be a bit tricky to make if you don't read the instructions on the video correctly. It's very fun to use and very portable. Small enough to fit in your pocket. Depending on how tight the tube is and how the dart is made, it can hurt you! So be careful and don't shoot at anyone or any living thing (except worms...).
Music made by me.