Have built several 10/22's and have three Chargers. IMHO, the barrel is the single most important aspect of any 10/22 build. I see folks pour money into everything else or install a cheap barrel and to me, that is backwards. Everything depends on a good barrel and if you want accuracy, a "good" one is what you need. For that, I mean a Clark, Shilen, Kidd, Lilja or similar.
I have also seen serious parallax issues with big variables when used at the upper magnifications at ranges of 75yds or less.