I'm coming from the country in which Zastava arms are produced (PPU ammo as well) and trust me there are many differences in quality. Mainly guns from the '80 are much better then those made in '90 and 2000+.
Domestic needs in my country are very small Zastava (PPU as well) mostly does not pay attention to the needs of domestic hunters. Export is important because it makes a profit.
In hunting shops in Serbia you can often find weapons that are not in accordance with the highest standards and those guns that have not passed quality control for export.
Gunmakers in Zastava know and can make excellent guns when they want to make them. If you have a connection in the factory, you can get an excellent rifle at a regular price.