e-luder was right, it was the piston head.
I examine the piston head from the used HK3P G17. It didn't look broken, although it looked too small to make a proper seal. So I took out the piston head from the working WE G17 and put it in the used HK3P G17. I put in a magazine and it crisply locked back on the last round.
Now I need a replacement piston head for the HK3P G17. Will the Guarder g17 piston head fit my HK3P G17 blowback housing?
Also
Quote:
Originally Posted by MaybeStopCalling
Woah, woah woah. TM nozzle or WE/HK3P nozzle? They're not dimensionally the same.
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Its a stock WE G17 nozzle