I guess the biggest question is what rings will work? My local gunshop didn't think the optilock would work. The front mount is 19mm but the back one looks like 13mm or there about. Can anyone with knowledge of the older Sakos please help? It is the L46 Riihimaki .222rem I would totally appreciate it if someone could help me get my feet up on this one. I have found lots of rings onlinebut want to make sure they work. Thanks a bunch