Next time dont buy a broken gun unless you know what's wrong with it. It's not cycling because your nozzle is too loose, therefore your piston cup cant push the air. That's the reason why its not blowing back and the trigger that hits the output valve would only stay in one spot to release all the air (thats the hsss your hearing). You need a KWA g17 nozzle, not the KSC glock nozzle. Its gonna be hard to find parts, if you can call KWA and able to do a special order on your G17 parts then your good to go, If you cant then your shit's out of luck. If you have enough money try to replace two things piston head (or your so called air seal chamber) and the right nozzle for your gun. I hope this can help.
Last edited by cjboi; June 30th, 2010 at 19:16..
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