You're still getting low fps and good compression with the stock piston, right? So it might be a mechbox alignment issue.
Also, does your air nozzle move back and forward freely with the mechbox closed?
You could also take the piston out, and run the gears with the motor to make sure the gear train runs properly.
Last edited by ThunderCactus; February 14th, 2014 at 10:47..
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