556x49mm
556x49mm is a type of ammunition used primarily in firearms, particularly in the United States. It is a rimless, bottlenecked cartridge designed to be fired from the M16 rifle and its variants, as well as other firearms chambered for this caliber. The 556x49mm cartridge is known for its reliability, accuracy, and versatility, making it a popular choice for military, law enforcement, and civilian use.
The cartridge features a 5.56mm (0.22-inch) diameter bullet and a 49mm (1.93-inch) overall length. It is typically
The 556x49mm cartridge was developed in the 1950s as part of the Armalite AR-15 rifle project, which