I bought 2 of these for my Ruger No 1 with a 30mm tube and 50mm Objective. The first ones I bough were the recommended High one but they left the scope still 3/8" above the barrel , these are 1/8" lower and give me better eye alignment. I like the Ruger brand rings better than all the after market rings, good solid steel construction. These are your best option for mounting a 30mm scope with a 50mm objective on a Ruger Number one.
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