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Removal of that bolt is a bit tricky. It does not come out to the front like it may appear. Assuming you have the barrel and action slide off, it is best to put the action in a padded vise, bottom up.
Run the bolt (breechblock) all the way forward, and pry gently on the ejector until it comes out of the side wall and you can ease it to the rear and up out of the action. Now, push in on the back of the bolt retainer, and slide the bolt back almost all the way to the rear of the receiver. Lift up on the back end of the bolt, and ease it up and out, making sure to guide the extractors through the cut outs in the receiver made for that purpose.
I don't recommend disassembling the trigger group, but if you really need to do so, be warned that the carrier pivot screw has a LEFT hand thread.
FWIW, I preferred to clean Model 12s by taking off the stock and then dunking the rest in the sonic tank. Still, once in a while, a really bad one would defy even the sonic bath and it was full disassembly time.
Jim
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