History of the vehicle.
With the Spanish Civil War in full swing, the Royal Italian Army began to realize that anti-aircraft means were needed to protect convoys from enemy aerial assaults. Thus began testing an anti-aircraft vehicle and the first vehicle that came out was a Fiat 618 armed with a heavy machine gun, but the vehicle lacked protection for the crew and the firepower was very inadequate. It was decided to test a vehicle armed with the Breda 20/65 Model 1935 Cannon-Machine Gun. The tests gave a decent result between 1937-38, but when the world war started the project was shelved. Yes, then I think of adding a shield to the 20 mm cannon but it would have reduced the already little space on the vehicle too much.
With the start of World War II and with the big problem of air raids on convoys, the Royal Italian Army ordered the Royal Italian Army Arsenal of Naples to add a 20 mm cannon to the Fiat-SPA 38 R trucks and throughout the war they were converted over two hundred, but despite this, very little is still known about the official service of the vehicle.
Dimensions (LWH): 5.783 x 3.5 x 2.6 m
Max weight: 3,6 tons
Propulsion: FIAT Tipo 18R , petrol, 4-cylinder, 4,053 cm³, 55 hp at 2,000 rpm
Max speed: 51 km/h
Range: 310 km
Armament: 1x Cannone-Mitragliera Breda 20/65 Modello 1935
Weapon traverse: 0°/320°
Ammunition reserve: 384 rounds