"Under Chinese law, one should be given a criminal penalty if he or she illegally owns more than 20 military bullets, 1,000 pellets for air guns or 200 non-military bullets." -- https://www.shine.cn/news/metro/1903040562/
For more on how strict Chinese gun laws are see https://en.wikipedia.org/wiki/Legal_issues_in_airsoft#China
> But if China does they better stop the illegal export of BBs and airsoft guns to the USA[...]
Manufacturing with an export license isn't the same as private ownership. You may be interested to know that the US exports a lot of arms you're not allowed to buy privately.