Yes, so long as it's a Title I firearm (not full auto or short-barreled rifle with a barrel under 16 inches), it's legal to own in your state, and you can afford it and pass an NICS background check.
You will have to call Ruger for the age; 100-400
1979-1981
Ruger's web site has sn data.
Go to the Ruger website, customer service, historical data, rifle, find your model, and there is a serial number/ date of production table.
Ruger website, customer service.
You can call Ruger or visit their website.
Ruger has sn data on their website that you can check.
Ruger has sn data on their web site.
Ruger's website has extensive sn data.
Ruger's web site has sn data.
Ruger has sn data on their web site
Ruger has extensive sn data on their webisite