I guess I'll close on the matter here with a show and tell saying she will stay where she is at.
It's on an old friend that has served severe duty for more than 10 years in the woods truck, ATV scabbard and handle bar racks, back floor boards, you name it, if I was not carrying a deer rifle or bird gun she was at least in the vehicle near by.
The link below will show you a cross between an AMT Small Game Hunter II and a Ruger 10/22. The AMT receiver started failing soon after purchase and gave us a fit so I swapped in a lighter and faster cycling Ruger 10/22 receiver. I am a machinist so believe me the fit is exact.
She is not dolled up and shows her miles but will drive tacks and light matches. Heavier than a 10/22 but lighter than her original form she shoots amazingly consistent or I would not lug it.
You will see air under the rear mount. Those are shims from Brownells to get the elevation near center in a bore sight before making adjustments.
With out them it took all of the elevation up and still not reach center. I re-centered the reticle and placed shims till she was close before making final adjustments. I fitted longer screws to compensate for the amount of shim.
The AMT receiver had machined dovetails on and the Ruger is as you can see. Somewhere in there the dimensions made for the elevation struggle. I didn't dwell on as to the root cause, I just fixed it. The scope rail has no torque on it. I form fitted it to lay there like that before fastening it. It has never came loose.
The rear but pad removes to expose a nice storage space. The bbl is fully floated.My Old Friend