Here's one Yugo that ejects perfectly, rearsenaled M59/66.
Here's another one ($40 parts gun) that had a very pitted bore and gas valve. It ejected when it felt like it and made nice 18" groups with tumblers at 50 yards.
So I put a Chinese barrel and gas tube on it. My Yugo-nese is a perfect cycler and 3" grouper now!