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.

Step 2: Disassemble the Ballpen

Disassemble the ballpen, take the core out.

Step 3: Make the Striker

Roll a strip of paper with the pen core as tight as you can.
Glue the tip.
Pull the pen core out.

Step 4: Make the Barrel

Roll another strip of paper around the striker.
Do not roll it too tight.
Glue the tip, too.

Make sure they can slide smoothly.

Step 5: Tape the Rubberband On

Pass the tip of the tape through the rubberband, then tape it on the striker.
Tape another tip of the rubberband on the barrel.

Step 6: Have Fun!

Fill a small ammunition in, pull the striker, release to fire.

I am going to make a auto refill one

Sorry for my poor English.