The M4 carbine is a 5.56×45mm NATO, gas-operated, magazine-fed carbine developed in the United States during the 1980s. It is a shortened version of the M16A2 assault rifle. Wikipedia
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Jun 8, 2010 · 29 Among the issues raised, the Colt M-4 carbines used for the test were drawn from the Army's inventory and did not meet military.