Developed in 1962 for the US military, the 223 Remington has become one of the most popular centerfire rifle cartridges in the world thanks to the wide-spread success of the AR-15 rifle. As 223 Rem is safe to fire in a 5.56 chamber, this gives AR-15 shooters the ability to shoot incredibly accurate and cost-effective ammo from their beloved rifles.
Continue reading History of PMC 223 Ammo here: https://ammo.com/brands/pmc-ammo/pmc-223-ammo#caliber-history