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Take it apart, separate the mechbox halves, and remove the spring guide/spring. Take the piston and slide it along the rails on the mechbox and see if it binds at all or is smooth and easy to move. If it binds, then use a file to open up the piston grooves until both halves slide easily. I had this problem with a Guarder full tune up kit two years ago, baffled me why the piston would jam back and not release.
This could NOT be your problem, but at least you eliminate the possibility.
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