Not the Z rings..."Signature Zee". may be different from what you are referencing. If you go to the Burris site,( or really read my previous post...) and read the downloadable information, you can see that it honestly dos not matter if your base/pic rail is not aligned in true fashion. The inserts can be rotated to off set lateral misalignment as well as elevation....and even diagonal. Theses rings are NOT just to prevent marring the scope finish, as I said in my previous post. They are to compensate for and correct the 3 reasons that scopes and barrels do not "co-witness" if you are critical in checking.