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You will have to call Ruger for the age; 100-400
1979-1981
Go to the Ruger website, customer service, historical data, rifle, find your model, and there is a serial number/ date of production table.
Ruger's website has extensive serial number data.
Ruger's website has extensive serial number data for all to look up.
Ruger has sn data on their website.
Ruger has sn data on their web site.
Ruger's website has extensive sn data.
Ruger's website has a serial number look up function you can use.
Ruger's web site has sn data.
Ruger has sn data on their web site
Ruger has extensive sn data on their webisite