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The F-35 also has six external pylons, three under each wing. The inboard station is designed for up to 5,000 lb (2,265 kg) loads and will most likely be used to carry external fuel tanks. The pylon can carry 2000-lb class air-to-ground weapons as well. The midboard pylon is also primarily intended for air-to-ground weapons and can carry up to 2,500 lb (1,135 kg). The surface attack weapons compatible with these two pylons include many of the same ones carried internally as well as additional stores that are too large to fit in the bays. The outboard station on each wing, however, is a dedicated air-to-air station carrying up to 300 lb (135 kg) and designed specifically for short-range infrared guided missiles like AIM-9X Sidewinder. A list of weapons currently planned for external carriage is illustrated below. Note that training bombs have not been included in this list.
You also ask about whether the aircraft has a gun, and the answer depends on what variant you ask about. The Air Force's CTOL model is the only version carrying an internal gun. The GAU-12 25-mm cannon is mounted above the engine inlet on the left side of the plane, as shown in the diagram below. 
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