ARCOVE also involved the Ordnance Department with the goal of improving the 90 mm gun and its ammunition. The Army expected difficulties in engagements with the Soviet IS-3 heavy tank, since the M47's M36/T119 90 mm rifled main gun could not consistently penetrate its frontal armor, even with special armor-piercing capped (APC) or HEAT ammunition. Work was performed to address this by developing the improved T300E53 HEAT ammunition and the T137 series of Hypervelocity Armor-Piercing Discarding-Sabot (HVAP-DS or simply APDS) ammunition for the M36 gun. The new APDS round could penetrate of homogeneous steel armor, angled at 30 degrees, at a distance of , but was not accepted for service. Instead it was decided to use an improved version of the 90 mm gun, the T139 for the M48 production tanks. It allowed for easier barrel changing and weighed less than the preceding M36/T119 gun. It was later standardized as the 90mm Gun M41 in February 1951.