I had to "right-click" the images and open in another tab.
Wow, that is an old one! The swollen area is machined to allow attachment of the rear sight. Like I said, this is an old one.
If you are reasonably handy with hand tools, you can purchase a stock and relieve it (inlet it) to accommodate the rear sight area. How is the rifle bore? If it isn't all that great, perhaps now is the time to swap out barrels. That will solve the abnormal contour of your barrel problem. The trigger adjustment screws control pull, creep and overtravel. There is an 8 page write up on this forum describing the adjustment; however, you have a lot of work to do before adjusting your trigger!
Hopefully, more knowledgeable members will click to view your photos and, thus, be able to offer better advice.
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