So I’ve been surprised by this as I don’t see any other use as lighting people on fire on a battlefield and yet I was pretty sure flamethrowers were banished in most of war conditions. And indeed the Convention on Certain Conventional Weapons has been signed in 1980 and applied in 1983 and included flamethrowers in the protocol III of the convention. This states : Protocol III on Prohibitions or Restrictions on the Use of Incendiary Weapons prohibits, in all circumstances, making the civilian population as such, individual civilians or civilian objects, the object of attack by any weapon or munition which is primarily designed to set fire to objects or to cause burn injury to persons through the action of flame Hungary signed it. So this is either for a high level Warhammer 40k cosplay or not even allowed to be engineered.