Piston cannon help

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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Acdcmonkey1991
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I am currently working on a new piston gun (my first piston gun), and I was wondering how I can get the barrel inside the chamber? THe gun is all metal so there aren't any fittings I could find to do so, I am mainly asking mitch. because my cannon is based off of his designs. What could I use?
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jackssmirkingrevenge
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mopherman
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What i did (and probably mitch) was grind out the stop in a compression fitting. be sure to get it all though, or it'l be crooked.
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