The BZ.303 project carried the best armament of Italian aircraft programs. It had eight 20 mm MG 151 (200 rpg), four in the wings and four in the nose (plus a 12.7 mm/.5 in gun in the dorsal position). It had radar and two Piaggio P XV RC60 engines of 1,081 kW (1,450 hp). Another version was provided with two DB 603 engines, and was called BZ303bis. In September 1943, there were contracts for several of these "new generation "Leoni"". At this point, Germany took over control of both Italian industries involved, CRDA and Breda.