perhaps darthmod significantly increases the chance of it? im sure theres an easily editable stat.I don't know if it works in vanilla, but muskets misfire quite often in darthmod. From what I can tell, they don't explode, but rather, just don't fire. The soldier just has to wait for the next volley and try it again, or, if in an irregular/non-volley unit, just keep fiddling with the musket until it works.
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