from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A .223-caliber, gas-operated, clip-fed assault rifle, first used by U.S. troops during the Vietnam War.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A lightweight assault rifle, originating from the Vietnam War period
M, military classification.(American Heritage® Dictionary of the English Language, Fourth Edition)