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Best left to a gunsmith
Best left to a factory trained gunsmith
Take it to a gunsmith for verification
You need a copy of the owner's manual for your rifle- trust me- parts of the bolt are tricky. You can get a copy for free from Winchester is you are in the US. The link below will take you to their order form on their website.
There is a screw underneath the barrel on the end of the frame, take out the screw, take out the mag, and open the bolt. Then just pull the frame off of the gun.
take it to a gunsmith
All Winchester model 12's are take-down designs. Winchester made a model 25 which is solid frame and very similar to the model 12.
don't take down a Winchester model 52, the way they bedded the rifle was a mystery. It may never shoot the same if you take it apart.
If you pull the trigger while pulling bolt out does not work . Then you take the big screw out of stock now with the barrel and stock apart , take the screw out of the trigger . With the trigger out of the way you will notice a piece that is the only thing left other than bolt , push on that small piece while pulling bolt and there you go . It will take less time and easier than for me to typr this out lol
To find out the value of a Winchester Model 8422, take it to a local gun dealer. They will be able to examine it and determine a value for you.
You need a manual. Contact Winchester or find a gunsmith and ask for help.
take it to a gunsmith