Formally presented within opening of FIATs Mirafiori plant in May 1939, the AB 40 ended up being, at the time, one thing of a cutting-edge car. As a result of innovative solutions including double drive and extra wheels mounted as neutral to greatly help overcome hurdles, it absolutely was a match for almost any foreign rival in the same class. The AB 41 variation, introduced in 1941, included a few improvements, yet its main gun (a 20 mm Breda 35 cannon) remained the exact same. Capable of over 70 Kph on the road and almost 40 Kph off road (twice that other vehicles inside Regio Esercito), it proved effective in combat inspite of the defects due to use of bad materials inside armour while the complex 4-wheel steering system. It absolutely was later on changed by the improved AB 43 variation