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The Chauchat, named after its main contributor Colonel Louis Chauchat, was the standard machine rifle or light machine gun of the French Army during World War I (1914–18). Its official designation was "Fusil Mitrailleur Modele 1915 CSRG" (in English: "''Machine Rifle Model 1915 CSRG''"). Beginning in June 1916, it was placed into regular service with French infantry, where the troops called it the FM Chauchat. The Chauchat machine rifle in 8mm Lebel was also extensively used in 1917–18 by the American Expeditionary Forces (A.E.F), where it was officially designated as the "Automatic Rifle, Model 1915 (Chauchat)". A total of 262,000 Chauchat machine rifles were manufactured between December 1915 and November 1918, including 244,000 chambered for the 8mm Lebel service cartridge, making it the most widely manufactured automatic weapon of World War I. The armies of eight other nations – Belgium, Finland, Greece, Italy, Poland, Romania, Russia, and Serbia – also used the Chauchat machine rifle in fairly large numbers during and after World War I. The Chauchat machine rifle was one of the first light, automatic rifle-caliber weapons designed to be carried and fired by a single operator and an assistant, without a heavy tripod or a team of gunners. It set a precedent for several subsequent 20th-century firearm projects, being a portable, yet full-power automatic weapon built inexpensively and in very large numbers. The Chauchat combined a pistol grip, an in-line stock, a detachable magazine, and a selective fire capability in a compact package of manageable weight (20 pounds) for a single soldier. Furthermore, it could be routinely fired from the hip and while walking (marching fire). The muddy trenches of northern France exposed a number of weaknesses in the Chauchat's design. Construction had been simplified to facilitate mass production, resulting in low quality of many metal parts. The magazines in particular were the cause of about 75% of the stoppages or cessations of fire; they were made of thin metal and open on one side, allowing for the entry of mud and dust. The weapon also ceased to function when overheated, the barrel sleeve remaining in the retracted position until the gun had cooled off. Consequently, in September 1918, barely two months before the Armistice of November 11, the A.E.F. in France had already initiated the process of replacing the Chauchat with the M1918 Browning Automatic Rifle. Shortly after World War I, the French army replaced the Chauchat with the new gas-operated Mle 1924 light machine gun. It was mass manufactured during World War I by two reconverted civilian plants: "Gladiator" and "Sidarme". Besides the 8mm Lebel version, the Chauchat machine rifle was also manufactured in U.S. .30-06 Springfield and in 7.65×53mm Argentine Mauser caliber to arm the American Expeditionary Forces (A.E.F.) and the Belgian Army, respectively. The Belgian military did not experience difficulties with their Chauchats in 7.65mm Mauser and kept them in service into the early 1930s.〔"The Chauchat Machine Rifle", p. 167-170 "Belgium"〕 Conversely, the Chauchat version in U.S. .30-06 made by "Gladiator" for the A.E.F., the Model 1918, proved to be fundamentally defective and had to be withdrawn from service. The Chauchat is the only full-automatic weapon actuated by long recoil, a Browning-designed system already applied in 1906 to the Remington Model 8 semi-automatic rifle: extraction and ejection of the empties takes place when the barrel returns forward, while the bolt is retained in the rear position. Over time, the Chauchat machine rifle's just passable performance in its dominant version (the Mle 1915 in 8mm Lebel) and the failure of its limited version in U.S. 30-06 (the Mle 1918), have led some modern experts to assess it as the "worst machine gun" ever fielded in the history of warfare. ==History== The design of the Chauchat dates back to 1903, and its long recoil operation is based on the John Browning-designed Remington Model 8 semi-automatic rifle of 1906, not (as so often repeated in the past) on the later designs (1910) of Rudolf Frommer, the Hungarian inventor of the commercial Frommer Stop pistol.〔Demaison and Buffetaut, 1995〕 The Chauchat machine rifle project was initiated between 1903 and 1910 in a French Army weapon research facility located near Paris: the "Atelier de Construction de Puteaux (APX)". This development was aiming at creating a very light, portable automatic weapon served by one man only,〔Tom Laemlein "That 'Damned, Jammed Chauchat': France's Infamous Light Machine Gun" ''American Rifleman'' October 2012 pp.71-73〕 yet firing the 8 mm Lebel service ammunition. The project was led from the beginning by Colonel Louis Chauchat, a graduate from Ecole Polytechnique, assisted by senior armorer Charles Sutter. Not less than eight trial prototypes were tested at APX, between 1903 and 1909. As a result, a small series (100 guns) of 8 mm Lebel CS (Chauchat-Sutter) machine rifles was ordered in 1912, then manufactured between 1913 and 1914 by Manufacture d'armes de Saint-Étienne (MAS). Because they were light, they were used temporarily during the early part of World War I to arm observation crews on French military aircraft. None of these CS machine rifles have survived, either in public museums or in private collections. Only a fairly complete photographic record of their past existence remains. In 1914, when World War I broke out, French troops did not operate any light machine gun. It was clear that this type of weapon had become indispensable in modern warfare, because of the increase in firepower it could provide to an infantry section. Spurred by General Joseph Joffre, it was decided to adopt the Chauchat, above all else because the pre-war CS (Chauchat-Sutter) machine rifle was already in existence, thoroughly tested, and designed to fire the 8mm Lebel service ammunition. Furthermore, due to its projected low manufacturing costs and relative simplicity, the newly adopted (1915) CSRG machine rifle could be mass-produced by a converted peacetime industrial plant. The term CSRG is made up of the initials of Chauchat, Sutter, Ribeyrolles and Gladiator,〔 four terms which are self-explanatory. Paul Ribeyrolles was the general manager of the Gladiator company, a peacetime manufacturer of motor cars, motorcycles, and bicycles located in Pre-Saint-Gervais (a northern suburb of Paris). The fairly large Gladiator factory was thus converted into an arms manufacturer in 1915 and became the principal industrial producer of Chauchat machine rifles during World War I. Later on, in 1918, a subsidiary of Compagnie des forges et acieries de la marine et d'Homecourt named SIDARME and located in Saint-Chamond, Loire, also participated in the mass manufacture of CSRGs. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chauchat」の詳細全文を読む スポンサード リンク
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