This scope is not designed to be mounted with rings. The rail is what I refer to as a "prism" type and is 14mm. This scope is designed to be mounted with a claw foot/base.The photos are a little confusing to me. It appears the scope is designed for a rail mount but may have a flatside on the bottom of the tube which would allow fitting to standard rings which would be either 1" or 30mm, I'm not sure which.