308ld,
Thank you for the detailed reply. Interesting that my rifle was made a good bit before the majority of the others.

Coyote Hunter,
I've got a question for you since you have 3 of these rifles (nice collection). Can you look at the serial number etched on your bolts to see if there is also a letter etched below the number? Mine has the letter "R" etched there. I was wondering what the significance is of that "R"? I thought perhaps it indicated that the rifle had been back to Ruger for some type of a bolt repair. Ruger told me that it was the initial of the person who assembled the rifle. The person I spoke with had to ask another Ruger employee about it for the answer, but they sorta sounded like that was a guess.
Thanks for your help!