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The United Defense M42, sometimes known as the Marlin for the manufacturer, was an American submachine gun in World War II. It was produced from 1942 to 1943 by United Defense Supply Corp. (a government-formed company specifically tasked with weapons development) for possible issue as a replacement for the Thompson submachine gun and was used by agents of the Office of Strategic Services (OSS).〔.〕 ==History== The M42 was developed by United Defense Supply Corp. specifically as a replacement for the Thompson submachine gun, which the U.S. military considered both expensive and complicated to produce. Made in both 9×19mm Parabellum and .45 ACP prototypes, the 9 mm version was the only one to ever see widespread production. Manufactured by High Standard Firearms and Marlin Firearms, about 15,000 were produced in the last three years of World War II. Only six .45 ACP prototype test guns were made. The weapon holds 20 9mm rounds in its magazine (designed by John E. Owsley, covered by patent 2,289,067) and can fire them at 700 rounds per minute. Frequently two 20-round magazines were welded face-to-face allowing a quick reload when the first became empty (see illustration). The weapon itself weighs (empty), with a length of . The barrel length is , and it has six-groove right-hand rifling. An extremely simple design, it was a straight blowback, selective fire weapon. It was built under "hurry-up" war conditions and some of its design flaws stem from this approach. Problems with the weapon were varied. Under combat conditions it was found that the sheet metal magazines had a tendency to warp out of shape causing feeding problems. They had little tolerance for exposure to large amounts of mud and sand and tended to jam if not cleaned regularly. The gun was also labor-intensive to produce. It used all machined parts, no stampings, and under wartime conditions machine work is at a premium. The M42 submachine gun was classified as a substitute standard when the M3 submachine gun was introduced. 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「United Defense M42」の詳細全文を読む スポンサード リンク
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