The Glenfield was made from 1973 to 1983. In the last production year, Marlin changed the model to 30-AS. In good condition, it's a very good deer rifle.
With the serial number that you have supplied,your Marlin(Glenfield) rifle was made in the year 1980.
Marlin Glenfield. http://www.marlinfirearms.com/About/History.aspx Marlin Glenfield http://www.marlinfirearms.com/About/History.aspx
1980.
1978
1978
Your Marlin model 30A was made in the year 1978,with the serial number that you have provided.
Contact the company Marlinfirearms.com for a free manual . It can be downloaded
1978
Do a web search. Try Nurmich Arms first.
1976. www.countrygunsmith.net
I would check the lower tang,under the lever.
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.