Ok, I just finished building it. Now comes the hard part- Waiting for the epoxy to dry :lol: I epoxied a piece of bicycle inner tube to the front of the piston, I think that should seal the barrel quite well. To stop it from digging into the piston, I fit the pipe inside a short bit of 6mm barrel fr...

Hello, longtime lurker, first time poster here. On the inspiration of JSR, I've decided to build a pengun. I picked up a 6" long 3/4" Copper pipe, as the air chamber, (I know, not exactly "Pen" size), and a 1/4" OD 8" long copper pipe as the barrel. My piston is going to be a hot glue plug molded fr...