Step 1: Materials
You will need PVC pipe, a balloon, duct tape, and airsoft bbs.
Step 2: Balloon
Cut off end of balloon and then put it around PVC pipe.
Step 3: Tape
Wrap tape around it so it won't fall off.
Step 4: Shoot
Load 1-3 bbs into the barrel. Pull back on the balloon and shoot. I am not responsible for any thing you do with this gun.