I have a PTR91 also. I used to have a Century G3 but got rid of it because the poor build quality plus the poor ergonomics of the HK rifle series couldn't be overlooked.
That said, the build quality on the PTR line is excellent...better than many HKs I've seen. The addition of a TacLatch paddle mag release (to get rid of the lousy, unreachable mag release) and a trigger job by Bill Springfield (to get rid of the terrible typical HK trigger pull) makes the rifle pretty good. Now to do something about the unreachable safety selector and ridiculous charging handle.
So in the end...I like the PTR91...but the FAL is better

