http://www.realguns.com/Commentary/comar185.htm has a wonderful, step by step instruction sheet.
Around $350
Model variation
Your serial number indicates that your Marlin rifle was made in the year 1972.
The year of manufacture for H = 1951. New type of trigger and sear in Model 336.
1964
The year of manufacture for H = 1951. New type of trigger and sear in Model 336.
1961 (August)-1962.
Your Marlin model 336 was produced in 1976.
what year was my marlin 336 serial number 26076513 made
the cs on a marlin model 336 stands for carbine standard.
Your marlin model 336 RC(regular carbine) was made by marlin firearms company in 1954.
Your marlin model 336 was produced in 1976.