![]() 50 caliber machine guns by using different jackets, barrels, and other components. The result was a single receiver design that could be turned into seven types of. Green studied the design problems of the M1921 and the needs of the armed services. A heavy barrel M1921 was considered for ground vehicles. Service trials raised doubts about whether the guns would be suitable for aircraft or for anti-aircraft use. They had light-weight barrels and the ammunition fed only from the left side. These guns were used experimentally from 1921 until 1937. 50 caliber M1921 Browning machine gun and an aircraft version. Ultimately, the muzzle velocity was 2,750 ft/s (840 m/s). 50 caliber round to have similar performance. ![]() The German rounds had a muzzle velocity of 2,700 ft/s (820 m/s), an 800 gr (52 g) bullet, and could penetrate armor 1 in (25 mm) thick at a range of 250 yd (230 m). 50 caliber was being developed, some German T Gewehr 1918 anti-tank rifles and ammunition were seized. The gun was heavy, difficult to control, fired too slowly for the anti-personnel role, and was not powerful enough against armor. It fired at less than 500 rounds per minute, and the muzzle velocity was only 2,300 ft/s (700 m/s). 50 caliber machine gun underwent trials on 15 October 1918. Winchester initially added a rim to the cartridge because the company wanted to use the cartridge in an anti-tank rifle, but Pershing insisted the cartridge be rimless. Winchester worked on the cartridge, which was a scaled-up version of the. 30-06 M1917 machine gun for a larger and more powerful round. Pershing asked the Army Ordnance Department to develop a machine gun with a caliber of at least 0.50 inches (12.7 mm) and a muzzle velocity of at least 2,700 feet per second (820 m/s). Pershing asked for a larger caliber machine gun. Consequently, the American Expeditionary Force's commander General John J. The armor made aircraft machine guns using conventional rifle ammunition (such as the. During the war, the Germans introduced a heavily armored airplane, the Junkers J.I. The larger rounds were needed to defeat the armor that was being introduced to the battlefield, both on the ground and in the air. Machine guns were heavily used in World War I, and weapons of larger than rifle caliber began appearing on both sides of the conflict.
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