Nice...looks very serviceable...
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IOR-Valdada used to make the STANAG rings in 30mm. They were much cheaper than ARMS and as good or better quality. I'm not sure if they still offer them or not.
E.A.W. used to make them also, and still will to order I believe. The ring caps have to be spread to get them over a 30mm tube I found, which is a bit of a PITA.