AR 15 Ammunition Types
AR 15 rifles typically use 5.56×45mm
and .223 Remington ammunition. However, what is  the
difference between the two? Here at Proguns.com, we want to
help you understand every aspect of your AR 15, and for this
reason we have compiled some information to help you decipher
AR 15 ammunition.
The first type of ammunition, 5.56x45mm,
is the U.S. military designation of ammo for their AR 15,
which they renamed the M16. Although the 5.56 and the .223
have identical dimensions, the 5.56 is usually designed for
higher pressures and velocities and is generally considered
to be unsafe to shoot from the civilian AR 15.
The civilian version of the 5.56 is the .223
Remington, which is simply a longer version of the now defunct
.222 Rem. Unlike the 5.56, .223 ammo is able to be safely
fired from both the M16 and the civilian AR 15.
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