M250 (XM250) with XM157 scope. Like replacing the M4, the US Army grew concerned with the 5.56mm round and wanted the soldiers to have ammunition that will penetrate the next-generation body armour. In the competition for the Next Generation Squad Weapons (NGSW), Sig Sauer which already supplies the Army’s pistols, the M17 and M18, and the new combat rifle, the XM7 won it with the new XM250.
