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I should have mentioned, both the the Norc 1911 and NP22 proved to be accurate and highly reliable, well worth the money. If I were a less picky person I would have a number of Norc Pistols.
I'm pretty sure if the Chineese wanted to know what Glock's exact formula for their polymer frame was they would have their hackers on it. If any aspect of their manufacturing process exists online (or any plastics company for that matter) like an inventory control system for raw materials, the Chinese already have it. As for the finish, you can get the instructions for ferritic nitrocarburizing on Wikipedia.
My guess is that the military's/LE agency's they sell to have never asked for a Glock copy.