The gun's original design was as a water-cooled machine gun (see the M1917 Browning machine gun). Once the bolt closed, the firing pin dropped and the round was fired, and the sequence was repeated (at a rate of roughly ten cycles per second) until the trigger was released or the ammunition belt was exhausted. Every time the gun fired a shot, the gun performed the sequence of extracting the spent round from the chamber and extracting the following round from the belt as the bolt came rearward, the fresh round ejecting the spent one when the bolt was to the rear and the fresh round was cycled in front of the bolt, then on the forward stroke chambering the next round to be fired, advancing the belt, and engaging the next round in preparation for loading. As the bolt slid forward into battery, the extractor engaged the next round on the now-advanced belt resting in the feedway, preparing to draw it from the belt in the next firing cycle. This caused the extractor to remove the first cartridge from the belt and chamber it (load it into the barrel ready to fire). The cocking handle was then pulled and released a second time. This advanced the first round of the belt in front of the bolt for the extractor/ejector on the bolt to grab the first cartridge. The cocking handle was then pulled back with the right hand, palm facing up (to protect the thumb from injury if the weapon fired unexpectedly, which could happen if the barrel was very hot), and then released. Loading was accomplished by inserting the pull tab on the ammunition belt from the left side of the gun - either metal links or metal tab on cloth belts - until the feeding pawl at the entrance of the feed way engaged the first round in the belt and held it in place. Two Marines with a M1919A4 on Namur Island during World War II Many NATO countries also converted their examples to 7.62 mm caliber, and these remained in service well into the 1990s, as well as up to the present day in some countries.
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The United States Navy also converted many to 7.62 mm NATO, and designated them Mk 21 Mod 0 they were commonly used on riverine craft in the 1960s and 1970s in Vietnam. The emergence of general-purpose machine guns in the 1950s pushed the M1919 into secondary roles in many cases, especially after the arrival of the M60 in US Army service. The M1919 was an air-cooled development of the standard US machine gun of World War I, the John M. The M1919 saw service as a light infantry, coaxial, mounted, aircraft, and anti-aircraft machine gun by the U.S. 30 caliber medium machine gun that was widely used during the 20th century, especially during World War II, the Korean War, and the Vietnam War. Closed bolt.ġ,500 yd (1,400 m) (maximum effective range) Saginaw Steering Gear division of General Motors
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