Another very interesting link.
http://www.carbinesforcollectors.com/yugo_serb.html
Especially this quote:
The Kragujevac works (unlike many of the other captured foreign arsenals and factories) was not a major source of supplemental weaponry for the Germans during WWII. The workers there en masse simply refused to cooperate with the Germans in any significant way, and the Germans feared deliberate sabotage of and damage to any arms and ammo made there (and the ammo made in Uzice) so much, that both the
Kragujevac and Uzice works were all but idle during 1941-45.