In response to a request in November 1942, the P.108A "Artigliere" "gunship" was developed for anti-shipping duties to supplement torpedo bombers. It was armed with a modified high velocity Cannone da 90/53 gun mounted in a redesigned nose. This was considered the most effective artillery piece in service, and in several versions was used as an anti-aircraft and anti-tank gun by the Army and the Navy. To be more effective in its new role, the size of the gun was increased from 90 mm (3.5 in) to 102 mm (4 in), a non-standard Italian artillery calibre, and fired shells weighing 13 kg (29 lb) as opposed to the standard gun's 10 kg (22 lb), with a muzzle velocity of over 600 m/s (1,970 ft/s).The gun together with its recoil system weighed 1,500 kg (3,300 lb). Due to it being a re-bored smaller gun, its weight was relatively low for its calibre.