USA
M2 Browning
The M2 Browning "Ma Deuce" is the century-old .50 cal heavy machine gun that remains the standard NATO crew-served weapon for anti-materiel, anti-personnel, and vehicle defense.
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Kord
Russia's standard 12.7×108mm heavy machine gun, developed after the Soviet collapse to replace the NSV and fielded on tripods, vehicles, and main battle tanks from the late 1990s onward.