If you want ridiculous accuracy with an AR you will have to pay for it. White Oak Armament Varmint uppers are the ticket. I've got a 24" 1:12 twist and 1-1/4" at 200yds is an every day thing and if all conditions right I can get 4 out of 5 in 1/2" at 200yds. Accurate enough? None of my other barrels come close for AR and for Bolt guns I have a couple that are close but it took a lot of load development.