Mule Deer gave excellent advice. I have the Burris signature rings on several rifles. The inserts come in .005", .010", and .020" offsets. This translates to about 5 moa, 10 moa, and 20 moa of offset with average ring spacing. You can double the moa by using offsets on front and rear mounts. And you may offset vertically, horizontally, or any position in between.
I put .020" offsets on my 264 instead of purchasing a 20moa rail. It was a lot cheaper and looks a lot cleaner. Plus my new Vortex Viper 6.5-20x will never suffer ring marks.
