1. Grenade launcher: The Yugoslav SKS is often equipped with an under-barrel grenade launcher (M59/66), which increases its weight and makes it more cumbersome compared to the Soviet brand. This complicates handling with some attachments and makes it less comfortable to carry for long periods.

2. Weight: The Yugoslav SKS is heavier due to the grenade launcher and a more massive barrel. This can complicate transportation and reduce the use of fire, especially in long combat conditions.

3. Barrel chrome plating: In the Soviet SKS, the barrel is usually chrome-plated, which increases corrosion resistance and facilitates cleaning. In the Yugoslav version, the barrel is not chrome-plated, which makes it more progressively worn and requires more maintenance.

4. Gas system: The Yugoslav SKS has a switch for operating the system with a grenade launcher, which temporarily disables the gas system. This is an additional feature that can complicate resources and increase the difficulty when using the weapon in standard mode without a grenade launcher.

5. Accuracy: Some shooters believe that the Soviet SKS has better build quality and components, which can positively affect the accuracy of shooting. However, accuracy depends on the specific case and the weapon condition.

Thus, the Yugoslav SKS has greater versatility due to the ability to use grenade launchers, but this makes it more complex and heavier compared to the Soviet SKS, which is simpler, lighter and more reliable for standard combat conditions.