Browning M1919A4

The M1919A4 traces its lineage directly to John Moses Browning's water-cooled M1917, which he demonstrated to the U.S. Army in 1917 by firing 20,000 rounds continuously without a malfunction. By stripping away the heavy water jacket and replacing it with a perforated air-cooling shroud, the U.S. Army got a weapon light enough for a rifle squad yet durable enough to arm tanks, jeeps, and fighter aircraft. The 'Thirty Cal' became so ubiquitous on the WWII battlefield that American GIs nicknamed any U.S. crew-served gun a 'thirty,' and decades later, 7.62 NATO conversions of the same guns were still being carried into battle by Israeli paratroopers in the Six-Day War and Canadian soldiers well into the 1980s.

The M1919A4 is the most numerous and widely exported variant of the M1919 series. It uses a short-recoil action with a vertically moving locking block, firing from a closed bolt, which gives it excellent first-round accuracy when used in the indirect fire role from a tripod. Unlike the later German MG42, the M1919A4 does not have a quick-change barrel in the modern sense - barrel changes require tools and are significantly slower, limiting sustained fire compared to contemporary general-purpose machine guns. The fabric belt used early in its service life was replaced by metallic disintegrating M1 links in WWII-era production. The M1919A6 variant, introduced in 1943, added a shoulder stock, bipod, carrying handle, and lighter barrel in an attempt to create a squad light machine gun, but at 14.7 kg remained heavier than most true LMGs of the era. Post-war 7.62x51mm NATO conversions were common - Canada's C1/C5, Israel's IDF conversions, and Rhodesia's variants all extended the platform's service life. The AN/M2 aircraft variant featured a much lighter receiver and an extremely high 1,200-1,500 rpm cyclic rate for aerial gunnery. Despite being superseded by the M60, the M1919 design's reliability, simplicity, and sheer numbers have kept it in irregular service around the world well into the 21st century.