Kaluni, I guess you can spend money on all sorts of parts for 10/22s but only a few actually have much to do with reliably .... mainly the extractor and magazine. My "build" is an exception because it was intended to be a match grade bench rest rifle. It turned out exceptionally well .... super accurate and functions flawless as long as I use expensive match grade ammo. It will totally choke on CCI Mini-Mags due to the tight Bentz chamber. My other three 10/22s include a Manlicher stainless, a TD stainless, and an older blued carbine. All three are "garbage eaters" and will function reliably with just about any brand of ammo. With exception of installing an Exact Edge extractor, all are box stock. They run about as perfect as possible, however accuracy is nothing to brag about like it is with my "build".
There's nothing wrong with factory parts and nothing to gain by using an aftermarket bolt handle, recoil spring, or bolt stop pin .... other than braggin' rights. My 10/22s have a lot of miles on them but I keep them clean and looking like new, so I never have crud buildup or excessive oil issues. I would bet my 10/22s will outlive me by at least a generation or two.
Just a few more comments .... all mechanical devices have an established tolerance for each part. Sometimes these tolerances stack in your favor and result in a very long service life. Sometimes tolerances stack unfavorably, which can result in failures to function soon after being bought. With a 10/22 or any other firearm, it is impossible to predict longevity by age or round count ..... there's just too many variables. That said, 10/22s are not precision rifles so they have pretty loose tolerances .... the exception being the sear and the extractor. This is why 10/22s are so reliable!!!
Here's my 10/22 build. It has standard factory parts in the receiver with a few exceptions. I installed an Exact Edge extractor and milled the bolt face for minimal safe headspace. The match grade barrel accounts for a terrific gain in accuracy but makes the gun a fussy ammo eater. I did a good trigger job, using factory parts and ended up with a 2.5 lb trigger. The scope's eye relief and the stock have been adjusted so they fit me like a glove. This gun weighs over 12 pounds so it wouldn't be very good for anything but benchrest shooting.