How to make a Paper Blow Gun

Step 2 The Barrel

Roll up a piece of paper around your index finger and tape it so that it doesn't come undone.
Roll another piece of paper around the first, slide to the end, tape closed, and tape to the first so that the long pipe of the barrel is about 22 inches long.

Roll another piece of paper around the long pipe and tape closed. Make sure that the short pipe is loose enough to slide through the longer pipe.