I will only buy these rings anymore.They are that good.
No more lapping rings,no more rings marks left on expensive scopes,plus the added benefit of being able to change the position of the scope to either line up with the bore or give you some extra adjustment without having to change you scope base.
I have 6-7 sets of them on rifles,and I'm waiting to receive a couple more.
Make sure you get the Signature Zee rings,the Signature rings don't have the adjustable inserts.
They have been hard to get for a while,Burris was having some kind of production problems,and everyone was out of stock.I received 1 set of 30mm rings 2 days ago,and I ordered them 3 months ago.