It's a M4. The magazine well is the tell-tale sign. That weapon is loaded with a 5.56mm magazine. On the CM901 the exterior of the magazine well would extend much further forward, as it must accommodate a 7.62mm magazine as well. Additionally, the magazine well on the weapon pictured has a flat/straight forward surface. The CM901's is angular.. http://soldiersystems.net/blog1/wp-content/uploads/2010/10/CM901-1.jpg
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