Contact the company Marlinfirearms.com for a free manual . It can be downloaded
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
Visit the Marlin website. They may have the owner's manual available for download. If not, they will supply you a paper copy, typically free of charge.
1978
Your Marlin model 30A was made in the year 1978,with the serial number that you have provided.
1978
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.
To break down a Glenfield Marlin 30A for cleaning, first ensure the firearm is unloaded. Then, remove the lever screw to take out the bolt and lever. Next, disassemble the lever mechanism and remove the carrier, hammer, and trigger assembly for a thorough cleaning. Finally, reassemble the firearm carefully after cleaning to ensure proper functioning.
Do a web search. Try Nurmich Arms first.
1976. www.countrygunsmith.net