Sethinator, My first 10/22 build for myself .... I bought a used 10/22 Carbine at a gun show for $150 . Little did I know the threads in the receiver for the "V" block and stock mount were stripped. After rethreading the receiver and making new screws, I went on a quest for perfection. I machined the bolt for headspace perfection and modified the trigger system for a 2 lb creep free trigger pull. I bought and installed a new 20" Green Mountain bull barrel. I also bought and installed a Fajen target stock. I then installed a 3.5~10X side dial 50mm scope. During the process, I test fired the gun several times and found the groups shrunk after each "upgrade". With all the work done, it now shoots tiny groups with match grade ammo and functions perfect.
My costs: Basic gun $150 (used), Scope $160 (on sale), scope base and rings $25, Stock$100 (on sale), Barrel $100, extra magazines $40, for a total of $575. If I would have paid someone to machine the bolt, rethread the receiver, or would have bought an aftermarket pre-machined bolt, you could easily add $150. Same for the trigger system ... had I not done it myself, it would have cost at least 50 bucks for a quality trigger. Had I started with a new 10/22, you could add at least $100. In other words, I could have easily spent $900 or more on this build. I did have a couple parts left over that I sold .... stock $25, barrel $25, which reduced my overall cost to $525.
I priced aftermarket parts ... receiver, bolt, and trigger group. This would save buying a new or used doner rifle but the total of just these parts were about double the cost of a brand new 10/22. I would expect to spend about $1k for a high quality 10/22 "from scratch" build.
Here's my 10/22 build: