When Ogre Geargrabber attacks its ability triggers, goes on the stack and you choose a target Equipment controlled by an opponent. When this ability resolves you gain control of the targeted equipment and attach it to the Geargrabber. This change in control only lasts until the end of the current turn. When the control effect wears off you remove the equipment from the Geargrabber. However this equipment does not reattach to whatever it was attached to before. It will be unattached and under control of it’s previous owner.