Originally Posted by Brian.Samson
They don't have much turret adjustment - buy some adjustable mounts.
Check the parallax ring is smooth all the way through it's range especially where it matters, sometimes the turrets can stop clicking even though they still move the ret, so check for that. Oh and it needs to be the RA model too.
Optically - they're hard to beat
Adjustable mounts. Less stress for scope and got user.
As an aside the alloy on them is soft. The tubes can be easily distorted. Pa rings can be as well just by squeezing with fingers. I did it on one to fix a warped pa ring...