Up to two Sparrow; and two, theoretically four or six, Sidewinder missiles were carried on all the hardpoints except the central (underbelly), or seven 340 kg (750 lb) bombs (normally, two-four 227–340 kg/500-750 lb). Range was up to 1,250 km (777 mi) with four tanks, ferry range 2,940 km (1,827 mi).[4] Aircraft allocated to air defence missions had their 20 mm (.79 in) M-61 Vulcan cannon removed. The F-104S was cleared for a higher maximum takeoff weight, allowing it to carry up to 7,500 lb (3,400 kg) of stores; other Starfighters had a maximum external load of 4,000 lb (1,814 kg).