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AR15

noun
\ 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

First Known Use of AR15

1963, in the meaning defined above

History and Etymology for AR15

from Armalite, the manufacturer

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