Ruger scout sight question.

Oops, I just saw this thread after I replied to your question in the Scout Rifle sticky so I'll repost it here as well.

I had the XS rail but sold it without using it as I wanted a different setup so can't measure it for you but from what I can determine on the XS website, the inside diameter of the ghost ring is 0.150 and the factory rear has an I.D. of 0.094.
 
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