Choate made the "Rynite" synthetic stocks for the 700 RS and Lee Six Industries made the "Arylon" synthetic stocks for the 700 AS back in the late 1989's and early 1990's.
The Rynite stocks were injection molded with a rough/pebble texture, while the Arylon stocks had a smooth finish and seemed harder/stiffer, maybe more rigid, than the typical injection molded stock. From the picture, your stock looks more like an Arylon stock than it does a Rynite stock.
