http://www.magnumresearch.com/
I'd just get a Volq' or a MR. I believe either of them will sell a stripped receiver, also.
I shot my 10/22 for a while. Then it sat in my safe, unused. It was unreliable, particularly if not freshly-cleaned, and rather inaccurate. The carbine stock may point well and fit with irons, but the drop is WAY too much if you scope it. Didn't like cheap ammo, either.
I realized that I had two choices: start pouring money into it, or sell it so I could buy something else. I chose the latter.
My Marlin 60 is more reliable, more accurate, more comfortable to load, has a much better comb fit with a scope, and it's cheaper. I have other guns to throw money at. All I wanted was a simple .22 semiauto plinker that would be fun to shoot and work when I grabbed it. The 10/22, for all the custom options it may offer, didn't do what I wanted from it.
That said, if Ruger ever built a rifle with the Mark II pistol action, I'd line up to buy it! My 22/45 is the most reliable gun I've ever shot, eats whatever I feed it, and shoots tiny groups, all without a single tweak or modification.