Earlier quoted context omitted.
Since when is Bulgaria and the Balkans a military industrial complex? I thought the Bulgarians made tomatoes and peppers and the Serbs made slibovitz and plum jam. Both countries are homes to great food. North Macedonia too.
Guessing by your name, you are a local? South-East Europe is a huge producer, and trade centre for small arms, sometimes to the big surprise of their own citizens. While small arms are peanuts in comparison to jet fighters, and missiles by value on the world's arms market, they are still there, and Balkan makers have good prices, and collaborative governments.
This article[1] sheds some light on small arms proliferation. Bulgaria and Serbia aren't even mentioned. While there are still lots of unlicensed rifles in the West Balkans[2], the bulk of small arms still comes from the US, Russia, China and Western European states. They're sold to dictators or given to rebel groups in conflict areas. The former are then stolen, smuggled and resold to rebel groups and civillians.
1. https://social.shorthand.com/ymuntaiwan/ug53Pq2PhT/disec-i-proliferation-of-small-arms-and-light-weaponry
2. http://www.smallarmssurvey.org/fileadmin/docs/G-Issue-briefs/SAS-AV-IB4-Western-Balkans.pdf