I've owned and upgraded chinese clones guns.
There's a reason I've sold them off and purchased a first-tier brand (Tokyo Marui)
Upgrade parts are MADE with high tolerances to Tokyo Marui guns... China clone guns do not have very tight tolerances to begin with.. so you WILL run into fitment issues.
But oh well.
Gun Technician and Tuner
Well versed in every AEG version and all major gas and spring systems.