It is rumored that some made it way to North Korea to fix the power problem.
The Stinger’s been cloned elsewhere, too - but the original Stingers we issued the Muj are long dead. If you somehow found a lone survivor and managed to overhaul the BCU unit (good luck with that), it would almost certainly explode when you fired it. The BCU can only last five years and the rocket motor ten at the outside.