This weapon has a second form, which must be designed as a separate custom weapon, must have the transforming customization, and doesn’t cost you any zenit.
While you have one of the two forms equipped, you can equip the other form whenever you want. During a conflict scene, you can only do so during your turn, while no other effect is being resolved, and only once per turn.
If one or both of the forms are martial (W ), remember that you must have the appropriate Classes to equip them. Additionally, a transforming weapon can still only have one Quality (the Quality applies to both forms).