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M16
or M-16
[ em-siks-teen ]
Trademark.
- a lightweight, gas-operated, magazine-fed assault rifle with a caliber of .223 inches, used for fully automatic or semiautomatic fire: a U.S. Army combat weapon for mobile units since 1963. Compare AK-47 ( def ), AR-15 ( def ).
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Word History and Origins
Origin of M161
First recorded in 1965–70
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