Is 223 and 5.56 the same thing?

The term “223” typically refers to .223 Remington, which is a popular rifle cartridge primarily used in civilian sporting rifles. It was developed by Remington Arms and is widely used for hunting, target shooting, and other recreational shooting activities.

On the other hand, “5.56” refers to 5.56x45mm NATO, which is a military cartridge developed for use in military rifles. The 5.56x45mm NATO cartridge has similar dimensions to the .223 Remington but operates at higher pressures. It is the standard ammunition used by the military in rifles such as the M16 and the M4.