This is a very solid mount at an extremely reasonable price. I did not experience the problems the other negative reviewers had. I used this to mount a large Leapers scope to a .22 tactical rifle. I was able to easily mount a red dot sight to the pic rail sections on the top. Everything sits solid as a rock. My only negative is that for me to be confident in the quick release cams, I tighten the adjustment screws to the point that it makes it difficult to unlock the cams by hand.
Pros: Low relative cost, Very solid attachment, additional pic rail segments on top of mount
Cons: Slightly heavy
This review was written in the old system and had content requirements that are different than reviews written today.