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  1. M4 carbine - Wikipedia

  2. Marine grunts react to switch from the M16 to the M4 - Marine Corps Times

  3. Marine Corps finally adopts the M4 as its main rifle - We Are …

  4. M4 Carbine - Military.com

  5. Commandant approves M4 as standard weapon for Marine infantry

  6. List of weapons of the United States Marine Corps - Wikipedia

  7. The M4 carbine was never meant to be a primary infantry weapon

  8. Marines field new rifle optic for better accuracy, hit probability

  9. M4 Carbine: A world’s most popular special operations forces rifle