I got a Guarder G17/26 piston head since it was on sale. It fits in the HK3P G17 and now it works fine. Also I got my HK3P G17 used and it came Guns Modify nozzle. The Guarder piston head works on it too
In short the unknown brand piston head that came with the HK3P G17 didnt work on the Guns Modify and WE nozzle. Then the Guarder piston head works on both the Guns Modify and WE nozzle.
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