I've only ever owned one rifle chambered in .223, a CZ M527 with sporter weight barrel. The CZ has a single set trigger, which I really liked. On it's very first trip to the range wearing a simple Weaver V9 3-9x38 scope and shooting 55gr SP bulk ammo, it was shooting .5 MOA groups. I ended up selling that rifle to an acquaintence and he has since been able to easily better that .5 MOA with handloads.