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  • Airsoft Anti-Aircraft Style Coaxial PVC Launcher

    I can try, it was a while ago. Go for it!

    It's "free floating" in the chamber. Best way to put it. The goal is to have it fit close to snug but not too snug. Air needs to pass around the edges of the piston when filling since the tank essentially is around the barrel. The piston gets pressed up against the section of barrel that extends into the chamber and the pressure of the chamber holds it "closed". Then once the sprinkler valve is opened (exhaust) the air to the rear of the piston escapes faster out the rear of the chamber and the air in front of the piston pushes the piston back and the air in the tank then escapes out the barrel. Basically the volume of air behind the piston needs to escape quickly enough or faster than the air in the tank can seep back around the piston and is therefore forced to pus...see more »It's "free floating" in the chamber. Best way to put it. The goal is to have it fit close to snug but not too snug. Air needs to pass around the edges of the piston when filling since the tank essentially is around the barrel. The piston gets pressed up against the section of barrel that extends into the chamber and the pressure of the chamber holds it "closed". Then once the sprinkler valve is opened (exhaust) the air to the rear of the piston escapes faster out the rear of the chamber and the air in front of the piston pushes the piston back and the air in the tank then escapes out the barrel. Basically the volume of air behind the piston needs to escape quickly enough or faster than the air in the tank can seep back around the piston and is therefore forced to push the piston back instead.

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