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SIG SG 540
The SG 540 is a 5.56×45mm NATO assault rifle developed in the early 1970s by Schweizerische Industrie Gesellschaft (SIG, currently SAN Swiss Arms AG) based out of Neuhausen, Switzerland as a private venture primarily destined for export markets and as a potential replacement for the 7.5×55mm Swiss SG 510 automatic rifle known as the Stgw 57 in Swiss service.
==History==
Work on a new generation of lightweight rifle using the intermediate 5.56mm round began at SIG in the 1960s and resulted in the somewhat unsuccessful SG 530-1 design that employed a gas-assisted roller-delayed blowback operating mechanism which proved too complicated and expensive to manufacture. As a result, in 1969 SIG chose to dispense with the complex roller-delayed action opting instead for a design using the more robust and simple piston-operated rotating bolt locking mechanism (derived from the Soviet 7.62×39mm AK assault rifle). This combination was to be successful and the rifle entered production as a family of weapons consisting of the base 5.56mm SG 540, the 7.62mm SG 542 battle rifle and the 5.56mm SG 543 carbine, where both 5.56mm variants were designed for use with 5.56×45mm NATO M193 ammunition, while the SG 542—the full size 7.62×51mm NATO rifle cartridge.
Production began between 1973–1974, but due to Swiss federal restrictions on firearms exportation, manufacturing had to be carried out at the MANURHIN (''Manufacture de Machines du Haut Rhin'') facility in Mulhouse, France.
The SG 540 series has entered service with the armed forces of several countries in Africa, Asia and South America as well as numerous law enforcement and security services. In 1988, the nationally-owned Portuguese defense manufacturer INDEP purchased rights to license build the SG 543 carbine for its own forces. Currently both the SG 540 and SG 542 are only manufactured in Chile, under license by FAMAE for the Chilean Armed Forces. Based on the SG 540, FAMAE developed a 9×19mm Parabellum submachine gun version of the weapon known as the SAF.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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