My G3 barreled .308 AK conversion is still working fine... last "are they broke yet" thread is here:
I will say that I can't seem to get as tight a group as I had expected. I may be using too heavy a round for the thread on that G3 barrel. I'm going to do some more custom loads in a few weeks and see how it works out. If I can't get the groups to tighten up on this 30+ year old barrel, then I'm going to re-barrel it with a rifling pitch to match these 168 grain bullets, and while I'm at it I'll make it longer from 18" to 24" - "just like" the SVU.