What's the difference between .223 and 5.56 Ammo? I am new to the AR.
Thank you Stephanie Anderson.
The .223 Ammo Round shown next to the 5.56 Ammo round:
.223 versus 5.56 Mil Spec Cartridges ....
Answer:
The .223 round was the first evolution of the AR15 platform used in Vietnam. Later it was expanded to the 5.56 (5.56x45mm NATO) round. While the cartridge diameters are essential the same, the 5.56 is generally a little longer (see picture above), and the chamber pressure is greater than the .223 commercial round set by SAMMI for those chamber limits.
The bottom line is the rounds are almost identical except for the pressure tolerances and limits placed on the firearm. A 5.56 AR15 Platform Rifle can fire either a .223 or a 5.56 round, but a .223 chambered firearm cannot fire a 5.56 round. Always check the firearm to make sure it is stamped 5.56 Caliber (see pictures below). When the switchover occurred some of the older firearms still had .233 Caliber stamped on the rifle. When in doubt consult the firearm manual, or call the manufacturer with the serial number (S/N) and they will advised you.
The following photos show Modern AR15 Platform Assault Rifles clearly marked with 5.56 Caliber on frame:
Armalite ....
Colt ....
OlympicArms ....
STAG ....
.223 Federal Ammunition (Ammo) ....
Remington .223 55gr Pointed Soft Point Hunting Ammo ....
5.56 Ammunition (Ammo) in bulk ....
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