And it should be noted that Burma has tried to get some self-sufficiency in small arms production since the end of WW2 and particularly since the 1960s (e.g. a factory was set up later that decade to produce the G3 rifle for the Burmese military). This desire for self sufficiency became even more relevant after the arms embargo against the country in the 1990s.
Other examples; Burma started to produce localized copies of the M79 launcher some time in the 1980s-1990s (near as I can tell without doing some in-depth research) and had made copies of the Uzi as well as producing an Italian designed SMG for a short period (the TZ-45 SMG, known in Burmese service as the BA-52).
They have acquired the licence to produce various weapons but have also been producing some models that possible/probably were made without a licence agreement. For example, a new handgun being made for Burmese military/police use appears to be an unlicenced Glock copy.
Wiki has some reasonable information (I say "reasonable" because some of the articles on Burmese made weapons need some seriously improved research to get even a reasonable quantity of info, let alone quality info)
https://en.wikipedia.org/wiki/Myanmar_Army#Weapons
A better source is from the Small Arms Review magazine: -
http://www.smallarmsreview.com/displ...darticles=1154
Plus Burma had been getting technical aid & assistance from China and North Korea along with buying weapons and vehicles made by those countries. There's speculation that Burma was producing chemical weapons sometime in the late 1980s or the early 1990s and there have been accounts of chemical weapons being used against dissenting groups in the region.
Other articles worth reading: -
https://www.irrawaddy.com/opinion/gu...ets-world.html
https://www.irrawaddy.com/news/burma...oil-firms.html
http://www.eastasiaforum.org/2016/06...opium-economy/