I remember being very surprised to find out that Wilson was putting shock buffers in these guns. But also since it's Wilson I assumed they had done vast amounts of testing with them to determine them GTG. Pretty disappointing and I bet the fellow with that gun was pretty pissed.
Only AK47 I've ever had malfunction is a very nice one that I still have that came with a shock buffer. Jammed like crazy til I took that damn thing out, and then magically it had AK reliability.