Air Compressor Cannon

So there are two holes at the bottom. The hole with the long barrel is the hole you put the air compressor on. The second hole is for safety. Simply plug it with your thumb or put duct tape over it. It shoots very far and is very loud. I recommend you sand the inside of the cannon and the outside of the bullet until they perfectly slide in. It MUST be airtight for it to work. It is hard to push it into the barrel but it works well. Do NOT push it inn all the way. Push it in until its right above the safety hole. Use a small stick to push the bullet through.
Here is a video of it being used: https://youtu.be/VvVcwG3aAik