Add here that the ML-20 also has a bug that prevents you from shooting after the shooting has reloading. This makes the ML-20 completely useless, I recently built the ML-20 and I wish I hadn't done it, very bad characteristics combined with a bug is a waste of resources.
This "bug" is just a UI thing that also happens to the Lefh. After the barrage is over the UI goes to 1 second cool down and it looks like it's bugged but barrage is available again once the actual cool down is over so no actual harm is done and the only issue is that it's confusing to the user.