I was just remembering the Mitsubishi Ki-109 version of the "Peggy" bomber fitted with the 75mm cannon sticking out the nose. Originally conceived to fly in pairs, with a searchlight plane and a shooter plane, it could probably get by without the light by using the light of burning cities. Production was probably slowed down because the plane and engines, with those troublesome hi-zoot superchargers, were being manufactured in burning cities.
Sorry about the obsession with big guns, but recent threads have done something to my brain and my medication hasn't kicked in yet.