This is a very simple gun with a range of about 10 feet. It looks like a pen and can even write like a pen. It shoots any kind of small objects.
Step 1: Disassemble
Take the pen apart. You should have a cap, a body, a spring, and the actual pen.
Note: try to find a pen without the protrusions on the side. If not, they will have to be cut off
Step 2: Attaching the Spring
This step took me two days to figure out. In the end, I used a bigger spring and hot glued it to the pen on one end. On the other, I wrapped duct tape around it until it was wide enough to clog the end. This makes it possible for the spring to shoot forward and launch the projectile.
Step 3: Putting It Together
The last step is to insert the pen into the body. Now all you need to do to fire is pull back and release.you might need to trim the end to make it fire better
Step 4: The Projectile
Really, anything that will fit in the barrel will work. I made a custom projectile out of a piece of plastic and some wax
Step 5: Tips and Troubleshooting
If the pen isn't firing well, the duct tape might have left some residue on the pen. To fix this, just pull out the pen (like you are going to fire it) and wet down the pen. If you have other questions, feel free to comment. Check out my other instructables and have fun!