I went back and forth for nearly a year, and despite no experience building one before, I decided the only way to get what I wanted and not waste $ having to swap out out of box upper parts for those I wanted just made sense.
I had to fire about 20 rounds to work out some issues but since then, I have had zero problems in the last 800 rounds I have shot through it.
I went with a ballistic advantage performance 9" barrel.
No complaints so far.
Right to bear often has great sales on 300bo barrels and upper recievers.