[F19Gladiator]

Saw a picture of a He 111H-6 from KG 27 on the Eastern Front showing a similar arrangement in the tail. Picture is not taken from as short distance as the one posted, but shows two "gun barrels" similar in dimensions and position.

Ref. "Luftwaffe at War 15, German Bombers Over Russia", Page 40, Manfred Griehl.