Meanwhile, the first metallic Z.1018s were completed. The first unit (MM.507) was completed on 22 September 1942, but the lack of engines and other equipment hampered the effort to complete the first order of 100 units. The first two metal units completed were interesting: MM.24824 was the heavy nightfighter version, and MM.24826 was the torpedo version. MM.24824 was exceptionally well armed, with four 20 mm MG 151 (800 rpg) and four Breda 12.7 mm/.5 in (1,400 rpg) in the nose and the wings. Also radar was specified for this aircraft, the German FuG 202. Italians, meanwhile, managed to produce the "Argo", a radar capable of locking onto naval targets, and an aircraft version, the "Vespa" (or "Arghetto"), smaller but still capable of being used to hunt naval targets. The final result of this effort was the "Lepre", an air interceptor radar, the ultimate radar developed in Italy during the war. None of them was fitted on the Z.1018 night fighter, which never was completely outfitted for combat.