Thanks again Jim,
There arn't any punch marks on the ledge. I am going to pull the stock off ASAP and take a look at the recoil lug.
I just had a little laugh after checking ebay for parts availability. There was a Lyman 48 apature sight like the one on this rifle that was bid up to $100, and a "NS" bolt that was going for $115. That's double what I paid for the gun so maybe this was a good buy after all.
I am enjoying the ID process as usual.