"Oberrender" mounted a main battery of two single turret-mounted /38 caliber guns, one forward and one aft of the superstructure, to protect against surface and aerial threats, directed by the Mark 51 Gunnery Fire-Control System.She also carried four Bofors anti-aircraft (AA) guns in two twin mounts, superfiring over the 5-inch guns, also controlled by the Mark 51 fire-control system, and ten single Oerlikon light AA guns.