Ruger or Buckmark.
My preference is for the Buckmark. The more open action doesn't contain as much of the excess garbage and filth that comes from suppressing rimfire.
I like the detachable barrel feature of the Buckmark. However, I hate having to remove the rear sight and have to re-sight it in to do so.
Leave the top strap attached to the barrel.
Remove only the rear screw, and loosen the barrel lug screw until the barrel and top strap assembly can be lifted off.
Even so, I find them seemingly very repeatable.
No one has had to touch the sights on my Standard, with two exceptions, since about 1992. 1. When I removed the top strap to replace a corroding lock washer. 2. When I got the barrel threaded.
I didn't have to resight after reinstallation.
Same for my Target model. My father was the last person to sight that in - in like 1991. The rail has been off for several reasons. Always returns to zero upon reinstallation.