The production of Italian tanks during the Second World War focused on the "M" series. The M-13/40 was the most famous and widely used tank of the Royal Army. Equipped with a 47mm cannon, it was notable for its unique track and suspension structure and for the protective "bolted" armor. On its chassis, the self-propelled gun M-40 was also developed. Armed with a 75mm howitzer mounted in a casemate, it was greatly feared by enemy armored vehicles. The best results were achieved through the combined use of M-13/40 tanks accompanied by self-propelled guns, which compensated for the tank's limited firepower. Throughout the war, both tanks and self-propelled guns saw improvements in technical solutions and armament.