Quote:
Originally Posted by Skruface
Sounds like an airseal problem. Check to make sure the hopup isn't torn - you may want to wrap it in some teflon tape (google will show you how to do that). Also, check the piston and cylinder head o-rings - they may have shrunk or torn. Also, if you have a cylinder with a hole in it, make sure the whole is at the back (towards the stock) and not the front (towards the handguard).
Ultimately, you cause yourself more headaches when mixing-n-matching parts - each manufacturer has different tolerances and QC, so in my experience I've found you get better results when sticking to parts all from the same manufacturer - at least in the major systems (gears + piston, piston head + cylinder + cylinder head).
A complete list of parts in your gun would help diagnose the problem - otherwise, send it to a gun doc.
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Here's the list of all my parts:
Guarder Reinforced Gearbox, Guarder Torque Gears, Systema Piston, Hurricane upgrade kit, Systema tappet plate, Airsoft Surgeon Stage 3 spring, and Classic Army Torque motor. My buddy bought the hurricane kit and new set of gears for his AK and it has more FPS than mine. Something just don't seem right here