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The M4 is light and more durable than the m-16 but is a smaller version. Caliber: 5.56mm NATO Action: Gas operated, rotating bolt Overall length: 838 mm (stock extended); 757 mm (stock fully collapsed) Barrel length: 370 mm Weight: 2.52 kg without magazine; 3.0 kg with magazine loaded with 30 rounds Rate of fire: 700 - 950 rounds per minute Maximum effective range: 360 m
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