AR 15 Chambers
Along
with using different ammunition, the civilian AR 15 and the
military version, the M16, also have different chambers to
account for the differences in pressure and velocity. While
they are quite similar, the two chambers still have different
names.
Referring to the name of the ammunition, the M16’s chamber is commonly referred to as a “5.56
NATO” chamber. These chambers are equipped to handle higher
pressures and velocities and can handle the 5.56 rounds.
The civilian or commercial AR 15 has a chamber not equipped
to deal with the heavy duty 5.56 ammo. For this reason, the AR 15 uses .223 ammo. The chamber of the AR 15 is often labeled
“.223 Remington.”
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