Finally found what I think is a nice example of an RIA/SA rifle. The rifle has an RIA Receiver in the 398,000 range with an SA barrell dated 4/30. The 2 bolt finger groove stock is unmarked as far as I have found so far. The only thing I can find that seems to be outside the appropriate range for the rifle is the bolt which is marked B-2 on the top of the handle which would put it in the very last range of SA production. Based on Vishooters chart I think it should be a NS marked bolt but I am still a happy camper.