First off Im not responsible for any injuries from this instructable. This is very simple and fun.
Step 1: Materials
Simple household items are all you need for this.
1. A pen with a big opening.
2.A thinner pen with a cap.
3. A grippy. (optional)
4. Airsoft pellets.
Step 2: The Base
Remove everything from the pen with the big opening. Cut off all the parts where an airsoft pellet can not fit through. It should look like this.
Step 3: The Barrel
Remove everything from the cap pen to where it looks just like this.
Step 4: Putting It Together
Fit the smaller pen part inside the bigger one. Use the grippy to put over the the big part. Thats where you put it in your mouth to blow the pellet out. If