So the Low and Medium rings won't work on an AR platform but these will. Rock solid from the very start, there were some focal length issues but not the rings fault. They went on well and as I tightened them correctly (as in image) they really locked the scope in place. If you have a great Athlon scope, spend the money on these. ONLY criticism is that 2 of the 8 screws were rusty. Not a big deal after I cleaned them, and they worked fine. Just would have expected perfection for the $.