22mm piston

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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qwerty
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On my 22mm coaxail i have hot glue piston it's okay, but opens very slowly. I don't have enough epoxy to make an epoxy piston so does anyone have an idea of what i could make it from?

I'll put it up in the showcase soon and with a sneek peek of my 22mm piston in a tee :)
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psycix
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-Tighter piston fit
-Lighter piston
-Better pilot valve

When casting an epoxy piston it shouldnt be solid epoxy. You should look into making it hollow or with a foam core. Its lighter, and saves you epoxy.
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qwerty
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Ok thanks i'll keep all of those things in mind.
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AngryChauncey
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Bondo is good too, and you can make it hollow/foam core as well.
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cannon monkey
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i used a big wood stick found outside :D cut it down and sand to size
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