Can an artillerist's Arcane Firearm staff receive the d8 bonus when casting any of the blade cantrips? Since the staff can be both an arcane focus and can supposedly be used as a melee weapon.
Specifically Booming Blade and/or Greenflame Blade
Additionally, if yes, which damage does the d8 add to? The bludgeoning from the staff, or the secondary damage types?
There is no reason the Arcane Firearm feature would not apply to booming blade or green flame blade - they are artificer spells, and the feature triggers when:
you cast an artificer spell through the firearm.
Both the bludgeoning damage and the thunder/fire damage count as damage rolls for the spell, so you can choose which gets the d8 from Arcane Firearm.
