I must admit I have fallen into this trap. I shoot a lot of carbine classes and purchased red dot sights, rails, NVD's etc etc. from China. The quality is well "China"
I finally figured out , all the cash I "wasted", I could have purchased top of the line equipment.
I write specifications for large govt construction projects, I have found that the quality control is very lacking. 316 stainless steel has a lot of carbon in it. This leads to failure. on an on.
It is still tempting
my two cents