FAQ: Do Blunderbuss units need line of sight and range to a declared enemy target unit in order to shoot?
(Rule)Description: Yes, as no exceptions to the main rulebook requirements for these items are listed in the Blunderbuss special rules. Note however that all enemy models caught in a Blunderbuss unit's 'fire zone" will be hit as normal, regardless of whether or not they belong to a enemy unit which the Blunderbuss unit has line of sight to.