This is one of the easiest things I've made yet and it is very fun. I am not to blame if anyone gets hurt.
Step 1: How to Make
You will need to take apart a regular bic pen so that it is a hollow tube then on one end you need to put a staple to hold the bullet in put the bullet on the other side of the pen and blow from the side with the staple
Step 2: This Is Also Stortage
This is also a storage compartment because you can put in as many bullets as you can then put the cap of the pen on and it holds your bullets