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Hi David and welcome back. It is drilled for a Weaver 417T : https://www.weaveroptics.com/bases/one-piece/multi-slot-bases/1000189.html ---- It mounts on top of the receiver.

drilled for a Weaver 417T mounted on top of receiver available here https://www.midwayusa.com/product/1009198354?pid=101772