I have a 20 in flattop upper and am having problems mounting my scope. I initially bought Millett High rings in the 1 in variety. I wasn't suprised that the adjustable objective scope sat against the free floating rail from YHM. I thought I would just use a set of Bushmaster mini risers from YHM and now it sits too high to get a good cheek weld.her

Edited to add....This was posted in the Optics, Mounts, and Sights forum but it's posted here because for lack of responses.

I went thru the same thing..but i went with ARMS 40H quick release rings..im very happy with them..sturdy,perfect height (for me) and quick release although i dont plan on taking it off.