there really isn't any metal slide or barrel upgrade to stay away from. They all serve the same purpose without breaking. get the tw ones if you don't care about appearance of the slide. they sell for under $100 and are made in taiwan; i think they have relations to KSC/KWA. Cosmetically nicer slides are Shooter's Design.
also you should note that when buying the metal upgrade, a enhanced recoil spring/guide-rod should be installed as well. a lot of companies make that part also, KM, Guarder, etc.
as for upgrading parts, the only part i can think of that you should stay away from is the HurricanE rocket valve for KSC glocks.
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