Day At The Range compared the accuracy of a Ruger 10/22 (with almost every component upgraded) against a stock CZ452 Varmint (with the trigger pull reduced to 1 lbs).
I disagree with Mr. RevolverGuy’s assertion that the CZ won the shootout. The Ruger shot the smallest groups, even if the CZ did better with a greater variety of ammunition. In a competition I would take that Ultimate Ruger 10/22 and a few boxes of Lapua X-Act. Saying that, it does show that a you can get great accuracy from factory guns without having to spend a fortune on upgrades. The receiver/bolt alone on the Ultimate Ruger 10/22 cost just about as the CZ452.