Abstract: An adjustable fixture for mounting any of a plurality of weapon sets to an aircraft includes a bracket and lugs that are adjustably mechanically coupled to the bracket. The fixture may be adjusted once, to achieve proper orientation relative to the aircraft for boresighting, and may thereafter allow switching of weapon sets, either of the same type or of different types, without a need for re-boresighting. Quick-release fasteners, such as quick-release pins, may be used to couple the weapon sets to the fixture, to allow for easy and rapid change of weapon stores. The fixture may include one or more adapters used to allow various kinds of weapon sets to be coupled to the bracket.