M4A1

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M4a1 (Carbine, 5.56 mm: M4) is a machine created in the United States on the basis of the M16A2 originally for crews of military vehicles and equipment.

Despite this, United States special operations command (US SOCOM) has taken this machine as a single for all u.s. special operations forces. It currently goes and the whole army of United States because greater convenience of shorter carbine at a time when most of the army is mechanized infantry combat vehicle crews, and supporting troops, more than enough to compensate for a slight decrease of its characteristics in comparison with a rifle.