Armament comprised a single forward-firing 0.303 British Browning machine gun outboard of the port engine and a Lewis Gun in a semi-retracting Bristol Type B Mk I dorsal turret firing to the rear. From 1939 onwards, the Lewis gun was replaced by the more modern Vickers VGO machine gun. A bomb load could be carried in the internal bomb bay set into the center section of the fuselage. Like most contemporary British aircraft, the bomb bay doors were kept closed with bungee cords and opened under the weight of the released bombs. Because there was no way to predict how long it would take for the bombs to force the doors open, bombing accuracy was consequently poor. The bomb bay could be loaded using a hand-operated winch incorporated into the fuselage.