223 Remington, due to the same casing, though some weapons might not be rated for the military-grade ammo. It can generally be used interchangeably with its parent round, the. Popular among civilians and soldiers alike, it is by far one of the most popular rounds in the wastelands. The standard type of 5.56mm ammunition, offering good performance to the shooter. Its performance and popularity among military forces endures despite the Great War: By 2287, it has served Americans for over two centuries, from the United States Army to the New California Republic Army. It is a rimless, bottleneck cartridge that offers tremendous wounding potential under the right condition. 223 Remington, originally developed for the M16 service rifle of the United States Army. The 5.56x45mm round is a rifle cartridge derived from the. The following section is transcluded from 5.56mm round.
