This double-action trigger mechanism, combined with advanced safety features including the hammer-lowering decocking lever, was incorporated by Sauer into the new P220 design. Their Sauer 38H had been produced in competition with other German makers such as Mauser and Walther at a time when new designs began to feature a double/single-action trigger. With SIG as their partner/owner, Sauer returned to the business of manufacturing handguns. During the war, they produced a handgun, the Sauer 38H, but afterward had withdrawn from this market. Prior to World War II, Sauer had been primarily a maker of shotguns and hunting rifles. Sauer & Sohn and the resultant company was called SIG Sauer GmbH, based in Germany. Sauer & Sohn, but in 1976 SIG bought J.P. It was initially developed by SIG and produced and distributed by J.P. SIG Sauer's line of handguns began in 1975 with the SIG Sauer SIG P220. Sauer and Sohn, which resulted in the formation of SIG Sauer. So in the 1970s SIG purchased both Hämmerli and J. Swiss companies which wish to do this have to do so by using a foreign partner. Swiss law limits the ability of Swiss companies to export firearms. The Petter-Browning patent was a refinement of the Browning Hi-Power (P35), which was John Moses Browning's last design which was created for the French 1935 pistol, but not adopted. The P210 was noted for its extreme accuracy. The P210 frame design incorporates external rails that fit closely with the slide, thus eliminating play in the mechanism during firing. This single-action semi-automatic P210 brought SIG much acclaim, due to the precision manufacturing processes employed in its manufacture and its resultant accuracy and reliability. It was adopted by the Swiss military in 1949 as the 'Pistole 49'. The SIG P210 pistol was developed in 1947 based on the French Modèle 1935 pistol (the Petter-Browning design was licensed). Upon receiving the 1864 government contract to produce rifles, the company name was changed to Schweizerische Industrie-Gesellschaft (SIG, German for 'Swiss Industrial Company'), known as Société Industrielle Suisse in French-speaking regions of Switzerland, reflecting the new emphasis on their production. It won and in 1864 the company was awarded a contract to produce 30,000 Prelaz-Burnand rifles, adopted as the M1863. The rifle was submitted to an 1860 competition by Switzerland's Federal Ministry of Defence.

The invention of this rifle is credited to gunsmith Jean-Louis Joseph Prélaz and army officer Edouard Burnand. The group pooled their engineering talents and created the Prelaz-Burnand rifle, known as the 'Prélaz-Burnand 1859' or 'Prelaz-Burnand 1860' rifle.

The origins of the SIG Sauer company lie in the company named Schweizerische Waggonfabrik ('Swiss Wagon Factory'), which was founded in 1853 by Friedrich Peyer im Hof (1817–1900), Heinrich Moser (1805–1874) and Johann Conrad Neher (1818–1877). KG, the Swiss SIG Sauer AG, and the American SIG Sauer, Inc. L&O Holding is the parent company of the German SIG Sauer GmbH & Co. in 2007, and since 2000 is organizationally separate from SIG Sauer GmbH. Its predecessor SIGARMS was founded in Virginia in 1985 to import and distribute SIG Sauer firearms into the United States: Its headquarters were moved to New Hampshire in 1990.

The American company is SIG Sauer, Inc (stylized as SIG SAUER).

Its predecessor SIG Arms AG was sold to L&O Holding in western Germany and was first renamed SAN Swiss Arms AG, commonly known as Swiss Arms, and in late 2019 was further renamed SIG Sauer AG. It was formed in 1976 as a partnership between Schweizerische Industrie Gesellschaft (SIG) of Switzerland and J.P.

The German company was SIG Sauer GmbH & Co.

The original SIG is now known as SIG Combibloc Group and no longer has any firearms business. The original company, Schweizerische Waggonfabrik (SWF), later Schweizerische Industrie-Gesellschaft (SIG), went through several selloffs, leaving the SIG Sauer brand spread over several companies. Several brother companies that design and manufacture firearms use the brand name SIG Sauer. Lüke & Ortmeier Holding Gruppe, aka L&O Holding

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