Question: The Northrop P-61 Black Widow had a gun mounted that was designed by whom?
Sentence (from "Northrop P-61 Black Widow"): It was armed with four 20 mm (.79 in) Hispano M2 forward-firing cannons mounted in the lower fuselage, and four .50 in (12.7 mm) M2 Browning machine guns mounted in a remote-controlled dorsal gun turret.
Relevant evidence: Yes