I think your some of your options are the picatinny or something along the lines of a one piece like the DNZ Game Reaper or the off set Weavers. There are others, but those come to my mind.
Some of the factory base's are reversible and will work with normal rings if you turn one or both around. I have long action Savage's with all of the above mentioned. They all have either the Pro Staff or BuckMaster scopes on them.
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