Own two Ruger 10/22's. I'm slowly acquiring spare parts from customizing my 10/22's. I've upgraded my target 10/22 with a Timney Trigger Block and custom bolt handle. The trigger block update made a world of difference in the way the gun shoots and was an easy change to make- if you can clean your rifle, you can make the swap yourself and won't need the services of a gunsmith. The customized parts were worth every penny.
The rifle is so popular, you can actually build a custom Ruger 10/22 and not have a single Ruger manufactured part in the final rifle.