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The following shit happened to one of my gun once:
Stock Hop up chamber is 1mm back, mags do not fit well.
Change to an aftermarket one, mags fit, but started to double feeding.
Filed about 0.4mm on the back of the chamber - no more double feeding, but mags do not fit again.
Put a small O-ring on the back of the chamber - mags fit, no double feed, but a ~50 fps drop.
Didn't realize it was a nozzle to hop rubber seal problem, checked the seal around the rubber and barrel, telfon wraped - no change.
Open up the gearbox, filed the tappet plate a little - small improvement.
Open up the gearbox again, filed a little bit more of the tappet plate - finally, everything is working fine.
Lesson Learned: Be aware of the nozzle to hop rubber seal, and cheap guns "eats" time.
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