browning m1917
The Browning M1917 is a belt-fed water-cooled heavy machine gun invented by John Moses Browning to equip the United States Military upon their entry into World War I. Despite looking similar to many Maxim guns such as the British Vickers Machine Gun or the German MG08, the M1917 shares no similarity with the Maxim design other than also functioning via blowback operation, and thus cannot be called a "Maxim gun".
Despite being ostensibly replaced by later designs such as the Browning M1919, the M1917's excellence in sustained-fire (laying down long bursts of continuous shooting, infamous for making any machine gun very hot) meant that it continued to see frontline use during World War II and the Korean War.