My nephew is wanting to build a "tack driver" AR in 5.56 but when I sent him to the White Oak Armament, Noveske and Compass Lake Engineering sites with recommendations his reasoning was he could buy an entire rifle for what they charged for barrels and three rifles for an upper. I am going to build his upper for him then advise as he as builds the lower himself. Afterwards will help him get the gas system tuned with proper buffer. Since I seldom buy lower price 5.56 barrels but all my ARP 6.8 barrels shoot exceptional for price range and my ARP 22 Nosler barrel has impressed me sent him to ARP for their 18" 223 Wylde stainless fluted 3 Gun barrel with 1:8 twist 5R rifling. Have three ARP 6.8 5R barrels and all are fine shooters so figured if he would not go with a tube I know shoots 1/2 MOA or better to recommend the ARP tube at $239. He told me ordered it day before yesterday so is inbound with all other parts on list I gave him. Anyone used this barrel here? Assume it will shoot sub MOA easily but just wondering what accuracy others are getting with it.