My Universal is for sure not USGI. It is tapped for the scope mount Universal made for their own rifles. I knew National made the Alpine and Santa Fe. I have been on the look out for one, but I have never heard of Rowan-Becker. I'll have to check that out. I thought the National Ordinance receivers were made in Ohio? or is that just some of them?

For National Ordinance what were the four blocks of serial numbers and can you date a rifle from them? I have one in the 7,000 range and one in the 11,000.