Thats certainly possible. They were on an old rifle I bought a few years back; no scope on it, just rings and bases. However, when I retrieved them from storage tonight a thin shim came loose from inside one of the rings, so they very well may be 26mm as you suggest. ( I removed those rings and bases from the rifke at the time andcrepkacwd them eith steel weaver bases and rings for a leupold VXR illum tmr 3-9*40 scope.
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