Occasionally can be found on eBay. Replacing the barrel on that model requires specialized tools, gauges and considerable gunsmthing ability.
Your Glenfield model 30A was made in the year 1979.
1975
1980.
1976
Marlin Glenfield. http://www.marlinfirearms.com/About/History.aspx Marlin Glenfield http://www.marlinfirearms.com/About/History.aspx
With the serial number that you have supplied,your Marlin(Glenfield) rifle was made in the year 1980.
1978
1978. sales@countrygunsmith.net
Right below the hammer.
1978
Yes, I have one. The difference as far as I can tell is it has a lower capacity cartridge tube. Also they are harder to find than the 30A.
Glenfield Model 30A, caliber is .30/30. Value is $125-$200 depending on condition. sales@countrygunsmith.net