Gents ,
Called Ruger today and ordered 2 of the extended rings
Very nice person and knowledgeable. She told me the
Web site for my No1 manufacturing date wouldn’t work as its too
old . She looked it up for me and said about 1977 or 1978
I’m not lucky so I’ve more than likely got a poor barrel
Time will tell
I should have asked her if Ruger would rebarrel it ?

Thanks to all for your time and help
Soup