The famous American M-16 rifle, which has been in service for many years, is becoming a thing of the past. It will be replaced by the new XM5 assault rifle of the German company Sig Sauer, which has its own branch in the United States. The M249 machine gun will also be replaced, it will be replaced by the XM250 light machine gun of the same company. One of the main reasons for the rearmament is the weak penetration characteristics of the 5.56 mm caliber cartridge, as a result of which the M249 machine gun and the M-16 rifle began to poorly penetrate modern army bulletproof vests. The characteristics of the XM5 are still unknown, however, according to experts, they largely correspond to its civilian version - the MCX Spear, that is, the rifle has a length of 80 cm and a weight of 3.8 kg. It uses a two-stage trigger and a 20-round magazine. The assault rifle will be equipped with a silencer as a base, so that future fights will be much quieter. Both models are chambered in .277 with a new 6.8mm cartridge that outperforms previous generations of 5.56 and 7.62mm rounds in terms of lethality and range. The US Army plans to purchase 250,000 XM5 and XM250 units. When entering service, they will receive the designations M5 and M250.