Make a rubberband gun with a piece of paper

I made this gun in a boring class, and it can shot a small paper ball for 5 meters.

Materials:
-a piece of paper ( I teared it from a notebook )
-a rubberband
-some tape
-a ballpen ( something like the core also works )
-some glue

Maybe you need something to cut the tape.

Step 1 Split the paper

Portrait split the paper to 2 parts from the middle.