I am not responsible for your stupidity
A medical bottle (advil or something)
A normal click pen
1.Drill a hole on the side and bottom of the medical bottle, make sure the pen can fit snugly through it.
2. Take your pen and rip off the front and the bottom of it.
3.Place your pen and put it in the bottom of the medical bottom
4. Take the small pointy part of your pen and wrap tape around it
5. Place that on the end of your barrel (pen) intill ready to fire
6.Take the cap off of your bottle and put it half way with bbs
7. Rescrew in the cap and make sure its shut
8. Take off the pointy part of the thing and hold the hole on the side and blow in the hole with the cap