How to Assemble and Disassemble a M2 .50 Cal Machine Gun | Marine Infantry Knowledge An informative video explaining how to disassemble and assemble a M2 .50 Cal Machine Gun in order to better instruct Marines for the operating forces. The machine gun, caliber .50, Browning, M2HB (M2 .50 cal), is a belt-fed, recoil-operated, air-cooled, …