The Hispano Mk.II cannons were now belt fed from box magazines allowing for 120 rpg (the system). The fairings over the Hispano barrels were shorter and there was usually a short rubber stub covering the outer cannon port. Redesigned upper wing gun bay doors incorporated "teardrop" shaped blisters to clear the cannon feed motors and the lower wings no longer had the gun bay heating vents outboard of the gunbays. To provide room for the belt feed system of the cannon, the inner machine gun bays were moved outboard between ribs 13 and 14. As the Spitfire was no longer to be used as a night fighter, the retractable landing lights were no longer fitted. D Type These were specifically made for the Photo-Reconnaissance Spitfires, including the PR XIX; no armament was fitted and the "D" shaped leading edges of the wings ahead of the main spar, were converted into integral fuel tanks, each carrying 66 gallons. To avoid the expansion of fuel in hot weather damaging the wing, pressure relief valves, incorporating small external vent pipes, were fitted near the wing tips. E type Structurally unchanged from the C wing, the outer machine gun ports were eliminated, although the outer machine gun bays were retained and their access doors were devoid of empty cartridge case ports and cartridge case deflectors. The inner gun bays allowed for two weapon fits; 2 × 20 mm Hispano Mk II cannon with 120 rounds-per-gun (rpg) in the outer bays combined with 2 × .50 cal Browning M2 machine guns, with 250 rpg in the inner bays. With of the relocation of the Hispano to the outer gun bay the blisters covering the feed motors were moved outboard on the gun bay doors. or 4 × 20 mm Hispano cannon with 120 rpg (this configuration was rarely fitted.) The 20 mm Hispano cannon were moved outboard and a more effective .50 calibre Browning .50 cal M2/AN heavy machine gun with 250 rpg was added to the inner gun-bay replacing the outer Browning .303s. The first trial installation of the installation (modification 1029) was made in BS118, a Mark XI in November 1943. This armament later became standard for all Spitfire Mk XIVs used by 2 TAF as fighters. The improved armament was more effective for both air-to-air engagements and air-to-ground attacks. The Mk XII flew operationally with their rounded wingtips replaced by shorter, squared