Not gonna argue that the price is cheaper. The reality is that at that price, they aren't real PTS units. They're knock offs. I've seen "PTS" sight sets avertised for as low $15.95 shipping included.

I mounted the rear knock off sight on my 15-22. The front one was so ******, it wouldn't work right so I put the oiginal factory sight back on.

Since I also have a scope and a TRS-25 red dot, I've never used the BUIS at all. So the fact that the rear aperture flips randomly between the two different hold sizes isn't that big of a deal.