2.5 inch piston port questions

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
jsefcik
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Im back into building guns, does anybody have a piston port 2.5 inch? If so im wondering what kind of power you guys are getting out of it being that its a rather bigger port? Any tips of anything appreciated
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matti
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I have 3.54" port in pistonvalve hybrid, I have also tested it with 8bar pressure with air and yes you will get lot of power from it :D

GGDT would help you.. We would need to know at least the pressure and chamber size etc. :!:
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