In dogfights, what determines whether a pilot uses a missile or the gun?

in modern dogfight, if 1 ever began between 2 fighter jets, determines whether pilot makes kill firing missile or using jet's gun. of time they'll use missile. case if in close range enemy plane they'll resort firing gun instead old days of air air combat.

in modern dogfight, if 1 ever began between 2 fighter jets, determines whether pilot makes kill firing missile or using jet's gun. of time they'll use missile. case if in close range enemy plane they'll resort firing their...

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