Weaver makes bases that fit the pre-drilled holes on the rail.
I have a set of original T-3 factory rings that I will let you have very reasonably if you are interested. I have used factory rings on my T-3's with no issues whatever, even though a lot of folks change them out it seems to be more or a "looney" thing rather than a need.

drover

223 Rem, my favorite cartridge - you can't argue with truckloads of dead PD's and gophers.

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