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M4 carbine - Wikipedia
The M4 Carbine: The Fighting Rifle (Arguably) Perfected
Colt M4 Carbine Review: A Classic AR-15 - Guns.com
M4 Carbine - Military.com
The M4 Carbine: Aged to Perfection - YouTube
[What's the Difference?]: AR-15 vs M4 - Pew Pew Tactical
M4 Carbine: A world's most popular special operations forces ...