.223 Brass

The .223 Remington (.223 Rem) is a rifle cartridge. The .223 Rem was first offered to the civilian sporting market in December 1963 in the Remington 760 rifle. In 1964 the .223 Rem cartridge was adopted for use in the Colt M16 rifle which became an alternate standard rifle of the U.S. Army. The military version of the cartridge uses a 55 gr full metal jacket boattail design and was designated M193.