Browsing through Sarna, I saw that the COIL guns are said to have been found in the bowels of the crashed mystery ship, like the rest of the LosTech to be found on the black markets throughout the region.
However, each weapon system has its manufacturer appended to its icon. For COIL, it's Herakleion.
Herakleion. AKA Jardine. One of "The Five" hidden worlds of ComStar cabal fame, dedicated to weapon development.
To me, this strongly suggests that COIL has no relation to the crashed vessel, but instead was put into the wild in the region by ComStar as a way to test out a new weapons system in a region with lots of conflict, where yet another new weapon system wouldn't be noticed amidst the flood of LosTech weaponry.
Your thoughts?