These are solid rings, so no worries there. They are hefty, but what else would they be holding a 35mil scope. Comes with the tool you need for mounting and adjusting... Don't loose it. I have not shot enough to be able to say whether they move or not, sorry I know that's the info you need.
Cons: Big and Heavy
This review was written in the old system and had content requirements that are different than reviews written today.