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M4 carbine - Wikipedia
AR-15 Vs M4 What Are The Differences - Primary Arms
The M4 carbine was never meant to be a primary infantry weapon
M4 Carbine - Military.com
The M4 Carbine: The Fighting Rifle (Arguably) Perfected
M16 Rifle vs M4 Carbine - Difference and Comparison | Diffen
Colt M4 Carbine - Army Technology
M4 Carbine: The Gun the U.S. Army Can’t Do Without
How the U.S. Army’s M4 Rifle Became a True Warfighter