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Your serial number indicates that your Marlin model 336c(carbine) was made in the year 1980.
100-450 USD
1954
marlin, model 336c
Will need the serial number to your marlin if we are going to help you on this question.
Marlin 336c 3030 The American Hunter #35 of 300... value?
The W means walnut. AC is walnut stained hardwood.
The value would be 150-350 dollars depending on the overall condition of your rifle.
Your rifle was made for Sears by Marlin, and is a model 336C.
These fine made old Marlin rifles will range in price from 200-400 dollars,depending on overall condition and a good bore.
My Brother has a 336C and he bought it new in the mid 60's.
Lower the lever and remove the lever retaining screw, pull the lever straight down out of the firearm. Slide the bolt out of the reciever, being careful not to loose the extractor. Reasemble in reverse. Here is a link to the owner's manual that may help. It is printable. Good luck. http://stevespages.com/pdf/marlin_336_444_1895.pdf