In this instructable I will show you how to make a 500 fps CO2 single shot airsoft gun.
I think putting this magazine on this would work good. www.instructables.com/id/Semi-auto-pen-airsoft-gun-w-mag/
I take no liability for what you do with this. This is very powerful and would go through human skin. This instructable is for informational use only.
Step 1: What You'll Need
You will need
1. A co2 bike tire inflator that has a valve so it doesn't let the co2 out when you screw the top on like some
2. A bic pen
3. Co2 for the inflator
4. Airsoft BBs
5. Electrical tape
you can buy a co2 bike inflator here
Step 2: Make the Barrel
To make the barrel, take the pen apart so you have just an empty tube. This will be your barrel.
Step 3: Attaching the Barrel
Now you want to tape the pen to the opening of the tire inflator.
Step 4: Firing
To fire you will put a bb in the barrel and hit the valve with your palm quickly.