What is a Ruger RG10 worth?

Sorry, but the RG was not made by Ruger. The Rheinemetal Gemeinschaft revolvers were made in Germany. To be painfully blunt, these were exceptionally poorly made, and have not been imported into the US in a number of years. Value is typically in the $25-$40 range if they are in working order. Please have it checked by a gunsmith before attempting to fire.