+1 Leland.
I have a friend who is married to a Chinese national who came to American for work and is eventually getting citizenship via the marriage (whole other thread). Anyway, he told me that she told him that Chinese businessmen pride themselves on working around the terms of any contract to their advantage. If it is not written, and there are no consequences, they just look at that as "oneupmanship", and you loose.
Sending good prototypes and then making a lot of junk is the most common one. Money spent. Sucker.
I have no doubt that Chinese manufacturing can be very good. However, most of their industry is built on and supported by government endorsed patent infringement. They know they can't get hurt, so why bother honoring patents and copyrights? That's a Western thing, not Chinese.
I try to take my money elsewhere, but for cheap consumer goods, it is nearly impossible to avoid. Just ask billionaire Jeff Bezos.
Would I buy a Chinese made (read SPA, Artemis, etc. branded) air rifle? Maybe. If I can get comparable quality and price elsewhere, I would go that route.