See link below-
20-50 usd
No
About $30
You can't it is not designed to come apart. Time for a new Scope.
Send it back.
The typical Marlin 39A does not have a scope. They are drilled and tapped that one can be added.
5-100 usd
It's worth between $10 to $15 used.
I just paid $10 for a used one. Reg.No.F. 7432C
bout 700 bucks i would say
Two numbers, such as 4x32, indicate the magnification (4 times) and the size of the front (objective) lens- 32 mm. A bigger lens is usually brighter. Three numbers, such as 6-24x42 or 6x24x42 will indicate a variable power scope- from 6 to 24 power, with a 42mm front lens.