Myanmar/Burma the strategy was build-to-capture: make improvised, unreliable firearms that could be used to ambush security forces and take their firearms.
Evidence against the point above that it's trivial to replace professionally manufactured small arms.
There are examples of all the above. Kachine state "army" for instance was making Chinese and AKM clones. Others were making FGC-9 for purpose of taking other firearms. Some were using FGC-9 for driveby without any goal to take firearms. And others were using "professionally" manufactured arms to take other arms.
Evidence against the point above that it's trivial to replace professionally manufactured small arms.