Seems as though there are some on going problems with chambers and ejectors. People that have purchased a barrel and bolt from different vendors and assembled their own seem pleased.
I have purchased from PSA before and found the parts quality and prices good, but the assembly is questionable. I have stripped and reassembled their uppers and have been pleased once the barrel is torqued, gas block aligned, etc.
If you must dissemble first you might as well assemble from scratch. Black hole weaponry barrel, AIM surplus bolt, Aero receivers. The PSA receivers seem good and are very close to looking like milspec ar15, but resale will suffer with the PSA roll mark.
Couple of bucks more, but better quality and accuracy with no headaches.