The Browning .30 Caliber Machine Guns, by Tom Laemlein. Initially designed during WWI, John Moses Browning’s .30 caliber water-cooled machine gun (M1917) has been considered the finest weapon of its type ever produced. Later followed in the 1920s by an innovative air-cooled design (the M1919), the Browning .30 caliber machine guns served U.S. forces from WWI through WWII and beyond the Korean War. The images in this photo study show the .30 cal guns in action with American troops throughout their long service history, in many exciting never-before-published photos. 203 Pages, Soft Bound. More than 200 images. New Condition.