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M4 carbine - Wikipedia
M4 Carbine - Military.com
The M4 carbine and M4A1 carbine (USA) - Modern Firearms
M4 Carbine: A world’s most popular special operations forces rifle
Army Picks Its Replacement for the M4 and SAW | Military.com
[What's the Difference?]: AR-15 vs M4 - Pew Pew Tactical
The M4 Carbine: The Fighting Rifle (Arguably) Perfected
The U.S. Military M4 Carbine: Design,... | US Military
Colt M4 Carbine - Army Technology
How the M4 Became Ubiquitous in the U.S. Military