Also considering Burris XTR Signature straight rings. Like the poly inserts. Never used them on anything but a bolt rifle. Any problems mounting ? Shoot loose with all the rock ‘n roll going on under them ?
Use a cantilever mount like the one you are asking about (Leupold mk ar mount) and save yourself some headache. The Burris XTR's work great on bolt guns. I use them a lot, but for an AR my vote is always going to be simple cantilever design.
