Lifetime bronze benefactor
That is the earlier model RSM with a 780 serial number prefix vs. the later 750 series. That sling swivel is not what I woukd call dovetailed. More of a floating sling swivel into a bit longer forearm than the later 750 series with the obvious barrel band sling mount. Mine was very accurate without a scope. Heavy gun, easy to shoot. Good solid rifle but definitely an early RSM.