The Beretta AR70/223 in its current state could not be submitted for the trials. In October 1980, NATO had chosen the Belgian 62 gr SS109 cartridge as the new standard for the 5.56x45mm round. Because the AR70/223 still ran on the older 5.56mm M193 cartridge, the platform required changes to accommodate the newly standardized SS109 cartridge. Furthermore, a significant defect in build of AR70/223 had been discovered. The receiver of the AR70/223 model was pressed steel box with bolt guides pressed in. It was found that the receiver would distort and jam the firing bolt, if the weapon was subjected to harsh circumstances. The result of these and other upgrades to AR70/223 platform would eventually spawn a new assault rifle design, which would become known as AR70/90.