I have a factory TC 23" bull match bbl. It is my favorite, and most accurate 22 rimfire. I use it mostly with the cheap Am Eagle brick ammo, and it's deadly on tree squirrels. I haven't missed one on the first shot yet. At the range you can cover a 5 shot group with a quarter (that's with the cheap ammo). I have some match rimfire ammo around here somewhere, and I'm always threatening to try it in the bbl, but I always seem to take a different bbl to the range?
It easily outshoots my Remington, Marlin, and my daughter's Savage.
Get one.
Oh, and mine's on a pre-easy open frame.