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Hi KenTsui, your upgrade blog is excelent, thank you so much.
You should know that the 650mm barrel is definitly to long for the cylinder in this gun. Even a bore up kit probably won't be enough. I upgraded mine to a 6.03mm 509mm Madbull V2 barrel. Also, after chronoing mine i noticed that the FPS values didn't seem to match what the spring should deliver. The reason for that isn't an airseal issue though, but due to less compression on the spring. The R&D department who thought up that Gearbox left about 1cm more space between the cylinder and the base of the springguide, resulting in less compression and so less energy output.
Also I tried various nozzle/bucking combos to achieve a good and constant airseal. I installed two aftermarket airseal nozzles, the one you used(i also added an O-ring), which gave me horrible FPS differences (maybe do to the HU/GB missalignment) and a czech made one which worked better but was still off. But both nozzles don't have that tapped design the orginal MG42 nozzle has. I achieved the best results with the original bucking/nozzel combo after i added an O-ring to the nozzle. And I also removed the screw between the hopUp chamber and the gearbox because in my gun somehow, it was the reason for the mentioned misalignment between the HopUp and the GB. The spring pushing the HU to the gearbox is more than capable to hold the hopup in place.
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