My PSAK GF5 is solid. I also had a 7” PSAK Pistol that shot about 2moa at 100 yards with Tula steel. Had a GF3 rifle that was also solid and performed similarity.
Out of those 3 I probably only have 3-4k rounds shot all together. But I haven’t had a single malfunction or issue in that time.
Have a couple GF3 and they run fine. I have read that they don't use the AK correct chamfer rivets on their receiver to trunnion connection. Although they might have changed that with their newer models.