Piston valve fill valve location

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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Bluetooth
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In my pneumatic piston valve canon that is curently being built there is a spring behing the piston that keeps it sealed very well can i pump it from the end of the chamber?
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Hayseed_Andrew
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I'd say you could fill it from wherever you feel like it.
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Slugfoot
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I have an over and under copper pneumatic that has a spring behind the piston which I fill from the muzzle end of the chamber with no problem whatsoever.
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noname
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If your piston is sealed with O-rings, you will need an equilization hole, but other than that you can fill from anywhere.
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SpudStuff
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You "can" but not with a fast fill rate. If the piston equilizes slower than the fill rate it will be theortically pushed backwards.
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Corporal 4
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Well im pumping it with a bike pump anyway so i dont think that matters and i already glued it and will be submiting it tomarrow.
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