If you do a thread search, you will find on old threads, compliants about the newly introduced PTR 91's.
I believe that PTR fixed all the problems. You just don't hear the same stuff anymore.
My PTR91 is a great rifle. With a Bill Springfield trigger job, I have a rifle I really like. I like the fact that the barrel is a new, Thompson Center made, barrel. I am certain that it is of higher quality than any military surplus barrel.
I took my PTR91 to a friend who has owned German HK91's, and he had a HK submachine gun. It was his opinion that the PTR91's workmanship was equal to his HK91. I examined his HK machine gun, and the PTR91 was at least equal in fit and finish.