INSURGENCY 2014 M4A1 SOPMOD Gameplay (BRUTAL REALISM/NO COMMENTARY/4K/NO HUD) 

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The M4 Carbine is a 5.56×45mm NATO, air-cooled, gas-operated, direct impingement, magazine-fed, select fire carbine. It has a 14.5 in (370 mm) barrel and a telescoping stock. It is essentially a lighter and shorter variant of the M16A2 assault rifle.