I have had two of the 20" 223Wylde 1:8 5R barrels and both shot great. But you really have to look them over when you get it. Both of mine had machining chips in the chamber, bore and in the gas port and was fairly oily. They are a great value but you will need to thoroughly clean any metal chips out of it and clean/degreaser before goin shooting with it. I do this with any new barrel but found more grit in the AR-stoner barrels.
Both barrels I had would shoot sub-moa if I did my part. I sold one rifle and I currently have the other one on a service rifle upper. If you get one experiment with other bullet weights. Mine shoots 55gr like it was made for it. Shoots 75gr great. Shoots 77gr and 69gr so/so but also loves 50gr pills. I haven't tried any 80gr single loads yet but I hope I can get them to shoot as they will be my 600yd load.