The rail pattern on this mount is made to 1913 picatinny spec. It will work with the OKO as well as the Trijicon Reflex, Aimpoint, BSA, Tasco, and potentially other types of red dot sights.
I bought this for my A2 carbine, but recently went to a flat-top, so I have no need for it anymore. It was mounted on the rifle for less than a month and shows only minor wear toward the rear of the mount where it fits in the carry handle sight channel. I was able to co-witness the iron sights with my OKO red-dot mounted.
Price is $55 shipped. Paypal is accepted with no surcharge. Otherwise, certified funds are required. If interested, please send email to [email]email@example.com[/email]