I bought a 223 upper a couple years ago with SS barrel. I was not impressed at all. Best I could get with factory match ammo was about 4 MOA. The best I could get with handloads was 3-4 MOA. I did everything I could with rebuilding and torque specs etc. Still the same problem. Finally decided to buy a new barrel and try that out. Was gonna buy a ballistic advantage when I got a notification that Midway had some of their barrels on clearance. So I said what the hell, I'll grab one for $65 and if it sucks, it's gonna have to suck really hard to outsuck that PSA barrel. After finding a decent load on the new barrel it's a 0.5 MOA on the regular with 77smk. On the other hand I've read reviews of people having good luck with PSA barrels. Maybe I just got a bad one? Maybe someone else can chime in on their experience with their barrels.