BB,
When I said trigger, I meant pull weight. Sorry for any misinterpretation. The biggest factor in improving the pull weight is to actually replace the hammer. Replacing the sear also helps a little bit but the hammer for sure. Any target hammer manufactured by a good company from any of the reputable sellers like
On Target will do wonders for pull weight. The additional stuff like shims, titanium, etc. are not all that necessary, IMO.
After having the action done on my first 10/22 by a 'smith, I now do my own after looking at the parts that were worked on. It isn't that difficult to modify the hammer but if it is your first time, buying one would probably be the best bet (and try your hand at modifying the stock one you're replacing).
Taking apart and putting together the 10/22 will seem like nothing after you do it a couple of times. (Like most any other machanical tool or engine.)
Like Detritus, I'm not entirely convinced about the need for a buffer either. The worst I've seen is that the holes of the bolt stop pin get a little looser over time and the pin falls out when the stock is removed. If I'm taking the gun apart where the stock is removed, I'll probably be removing the pin anyway. When the gun is put back together, the pin stays in place by the stock. I've taken apart the receiver and trigger housing so many times those pins just fall out too. Again, held in place when in the stock.