Greatly depends upon the Nation being flown as, and the mission at hand..
Wiki:
The basic armament of the F-104 was the 20 mm (.79 in) M61 Vulcan Gatling gun. This weapon frequently had shell ejection problems resulting in avionic problems and crashes. The Starfighter was the first aircraft to carry the new weapon, which had a rate of fire of 6,000 rounds per minute. The cannon, mounted in the lower part of the port fuselage, was fed by a 725-round drum behind the pilot's seat. It was omitted in all the two-seat models and some single-seat versions, including reconnaissance aircraft and the early Italian F-104S; the gun bay and ammunition tank were usually replaced by additional fuel tanks. The gun's location was advantageous as gun-flash was not in the pilot's line of sight, therefore not robbing him of night-adjusted vision. Two AIM-9 Sidewinder air-to-air missiles could be carried on the wingtip stations, which could also be used for fuel tanks. The F-104C and later models added a centerline pylon and two underwing pylons for bombs, rocket pods, or fuel tanks. The centerline pylon could carry a nuclear weapon; a "catamaran" launcher for two additional Sidewinders could be fitted under the forward fuselage, although the installation had minimal ground clearance and made the seeker heads of the missiles vulnerable to ground debris. The F-104S models added a pair of fuselage pylons beneath the intakes available for conventional bomb carriage. The F-104S had an additional pylon under each wing, for a total of nine.[citation needed]
ventral pylons and wingtip tanks
4 fuel tanks
various bombs
the cannon M61 Vulcan
just a few examples... there are dozens of loadout variations, dependant upon nation, and mission.. do a google search!
hope this helps...
P.S.: for its own slot.. is it possible to lose that under nose Gunpod, and make it a bit faster??