The quality and the insane amount of engineering that is this mount is mind boggling. Take your time and follow the steps, you will not be disappointed. Worth every penny which is why I didn't consider any other AR scope when I needed another one. Buy with confidence!!
I have a left ejecting upper because I shoot off of my left shoulder most of the time. When I went to clamp this mount onto the upper the deflector would not allow the back quick mount to lock into place at the location that was the best for my scope. At first I thought that I could remove the lever and grind off the lower tab to clear the deflector. Upon further study I saw that I could flip the offending lever 180 degrees and have it lock into place. I removed the levers and flipped them and now there is no interference with the locks.
This is a great mount, solid lock up and great quality.
In classic ADM form, this mount is absolutely fantastic. Best true QD, best return-to-zero, rock solid construction, and looks awesome!!