Poorly milled - NcSTAR AR Carry Handle Mount w/ Picatinny Rail

I could not get my optic mount on this product. I even tried filing down some of the edges to get it to fit. It was WAY out of spec. How hard is it to manufacture a product to milspec? Bet the farm that this is made in China. Would not be my first experience with cheap crud from there (a set of poorly made decapping pins for a sizing die purchase from Amazon comes to mind). As always be very suspicious of a product that is dramatically less expensive than the other choices. I think OP is an excellent company, they just need to weed this product out of their inventory. It was so inexpensive that I did not want to make an issue of it with OP.