Formally presented through the opening of FIATs Mirafiori plant in-may 1939, the AB 40 was, during those times, one thing of a cutting-edge vehicle. Due to revolutionary solutions particularly double drive and additional tires mounted as basic to help overcome hurdles, it turned out a match for any global rival in identical course. The AB 41 variation, introduced in 1941, included some improvements, yet its primary gun (a 20 mm Breda 35 cannon) remained exactly the same.