He didn't specify, but it sounded like a variety of issues. He said most the Glocks had several failures each over the weekend, his was the only pistol to not have some kind of malfunction.
Against all advice, I once tried an NcStar front sight. After each shot it folded down, it couldn't be adjusted low enough to acquire zero, and after ~60 shots the post fell out completely.I put an NcStar red dot on the Saiga with that technique and it shot loose in just a few drums. I put it back on with proper torque and it stayed on until the NcStar died about 400-500 rounds later. (It was almost free and I wanted to see how long it would take the Saiga to kill it. Answer: Not all that long.)
Against all advice, I once tried an NcStar front sight. After each shot it folded down, it couldn't be adjusted low enough to acquire zero, and after ~60 shots the post fell out completely.