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The M30 106.7 mm (4.2 inch, or "Four-deuce") heavy mortar is an American rifled, muzzle-loading, high-angle-of-fire weapon used for long-range indirect fire support to infantry units. The M30 system weighs 305 kilograms (672 lb) including the complete mortar with a welded steel rotator, M24A1 base plate, and M53 sight.
The M2 4.2-inch mortar was a U.S. rifled 4.2-inch (107 mm) mortar used during the Second World War, the Korean War, and the Vietnam War. It entered service in 1943. It was nicknamed the "Goon Gun" (from its large bullet-shaped shells, monopod, and rifled bore) or the "Four-Deuce" (from its bore size in inches).
employment of the 60-mm (M224 and M19) mortars, 81-mm (M252 and M29A1) mortars, 4.2-inch (M30) mortar, and 120-mm (M120) mortars. It discusses the practical applications
The M30 is able to fire most ammunition types used by the earlier M2 Chemical Mortar, but a newer range of ammunition was developed to provide increased range. The maximum range is 6.8 km for high explosive shells. Smoke and illumination shells can be fired out to 5.7 km.
14 Φεβ 2022 · Page details technical specifications, development, and operational history of the M30 (4.2-inch / Four-Deuce) 106.7mm Heavy Mortar System including pictures.
The 4.2 inch M30 mortar was a rifled muzzle-loading weapon designed for high-angle fire. Weight (with base plate, base ring, and sighting equipment): 626 lb. Barrel assembly: 158 lb; Standard assembly: 58 lb; Bridge assembly: 151 lb; Rotator assembly: 57 lb; Base plate: 108 lb; Base ring: 100 lb
Both the early M2 and the newer M30 were called "Four-Deuce" because of their caliber in inches (4.2). The M30 is still serving a handful of operators, including Brazil, Greece, the Philippines and Saudi Arabia.
