mid westgunworks.com has what you may need. The model 120 is the same internally as a model 1300, you can download a factory manual from the Winchester website for a 1300 if you need one.
This bolt is the same one used in the Winchester model 57, 69 and 75 rifles.
Numrich gun parts corp.They may be found on the web.
It is the same as a Winchester model 141 and parts are available from Numrich gun parts
Winchester
Your Sears Model 2C rifle was made by Winchester as their Model 131. SOME parts are available from Numrich Gun Parts Corp. See link below that will take you to the Numrich catalog for the Winchester 131.
The model is obsolete, however we have a good supply of parts for that model. sales@countrygunsmith.net
Yes
No.
Not likely
Could be dirty, could be ammunition, could be worn parts.
Yes.
Winchester, Its a very old Rifle, but the 53 was what turned into the model 70, Hince Winchester Model 53 and some pre64 model 70 parts should fit.