Same as a Marlin 336. Order parts from Numrich gun parts, Hurley, NY
Levor screw
I would check the lower tang,under the lever.
Your Glenfield model 30A was made in the year 1979.
With the serial number that you have provided,your Glenfield model 30A was made in the year 1977.
Contact the company Marlinfirearms.com for a free manual . It can be downloaded
1975
It is the exact same rifle as the Glenfield Model 30A, and yes parts are the same as the Marlin 336. Forearm is the cap style.
1976
1980.
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