EGW one piece picatinny rail and the Burris Signature Z Rings. You can get the "Off set inserts" and this will prevent running out of windage. Use the off sets to align the scope.

Added bonus, is they never mar the scope.

Best price I have found for the rails http://www.joeboboutfitters.com/. If your Military or a LEO, you get an added little discount. They are great to deal with.