The C42 by Waffenfabrik Bern, 6.45mm Rifle version Production In 1981, the experimental 6.45mm GP 80 cartridge was rejected in favor of the more conventional SIG 5.6×45mm Gw Pat 90 round (with a 4.1 g, tombac-jacketed, lead core projectile) that is the Swiss equivalent to NATO's standard 5.56×45mm cartridge. The solicitation was narrowed down to two designs: the W+F C42 (developed by the state-owned Waffenfabrik Bern, using both 6.45×48mm and 5.56×45mm cartridges) and the SG 541 (developed by SIG using the SG 540 as the basis for the SG 541 prototype). Another aim was to reduce the overall weight of the rifle while retaining comparable or improved accuracy out to 300 m. Emphasis was placed on modularity the weapon family was to include several variants of the base design, including a compact carbine that would be issued to rear-echelon and support troops, command staff, vehicle crews, special forces personnel and paratroopers. In 1978, the Swiss armed forces formulated requirements for a successor to the Stgw 57 battle rifle (known commercially as the SG 510) using the 7.5×55mm GP 11 cartridge. The rifle is based on the earlier 5.56×45mm NATO SIG SG 540. "SG" is an abbreviation for Sturmgewehr ("assault rifle"). The SG 550 is an assault rifle manufactured by SIG Sauer AG (formerly a division of Schweizerische Industrie Gesellschaft, now known as SIG Holding AG) in Switzerland. Rear: rotating diopter drum with tritium night inserts front: hooded post with folding night post 5-, 20-, or 30-round detachable box magazine.300 AAC Blackout (used in SG 553 BK variant) SIG Sauer AG (formerly Schweizerische Industrie Gesellschaft and Swiss Arms)
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