\ ˈāˈär(ˈ)fif¦tēn \
variants:
or AR15 rifle
plural -s
Definition of AR15
: a . 223 caliber gas-operated semiautomatic rifle that is essentially a civilian version of the M16
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Merriam-Webster unabridged
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Time Traveler for AR15
The first known use of AR15 was in 1963
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