I (along with others,) have discussed this with the folks at Ruger in the past. Their records,,, are in boxes,,, NOT in any real order, stacked in a few rooms, floor to ceiling. Getting details isn't easy,,, and it would cost them a lot of time to have a person search for a certain firearm in a mountain of boxes & papers. A $10 letter won't even begin to cover the costs.
It took John Dougan weeks of working to get some of the data he got when he was researching his book. He was NOT getting paid for it either.
While we live in a world where computers allow data almost instantly, we THINK we should be able to get all this. Well, the truth is,, before that data can be that easy to retrieve, it has to be entered into a database into a computer somewhere.
I agree it would be nice if we could get more info,,, but I also understand reality. Maybe someday, somebody who is computer savvy, AND who can get access to these records can & will build the database we desire.