See link below-
No
20-50 usd
You can't it is not designed to come apart. Time for a new Scope.
About $30
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
I have one on my .44 mag and so far it works fine. A .44 mag rifle doesn't recoil as much as a 30-06 though. Also there's the issue of parralax. The Nikon is set for 50 yards where the '06 really needs a scope set for at least 100-200 yards to take full advantage of it's capabilities. If all your shots are 50 yards or less try it. It's a 50/50 proposition
bout 700 bucks i would say
Priceless! ... actually around $450 depending on condition, but they were made by Tikka of Finland some as early as the 60's, they are quality firearms for the price