So I've had my 10/22 for about 15 years. Put 10's of thousands of rounds through it since I was a kid, and now my son has been shooting at the range. Despite stripping and cleaning it, it's gotten to the point where it will not reliably cycle the bolt, regardless of mag brand (Even using the factory Ruger 10 rounders). The inside of the receiver has considerable wear, but the bolt itself cleans up like new.
What parts should I look at replacing first that are long over their life expectancy?
If its not extracting get a new extractor. Volquartsen makes a good one
If its not loading id get a new spring