M-16

[ em-siks-teen ]
/ ˈɛmˌsɪksˈtin /

noun, plural M-16s.

a lightweight, fully automatic rifle shooting a small-caliber bullet at an extremely high velocity: a U.S. Army combat weapon for mobile units and jungle fighting.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019