The SP2022 is a full-size polymer pistol inspired by the SIG classic line. The SP2022 features the same DA/SA trigger found in SIG SAUER. The SIG Pro is a series of semi-automatic pistols developed by SIG Sauer in Exeter, New Hampshire. It became the first polymer-frame handgun from SIG Sauer and one of the first pistols to feature a built-in universal accessory rail and interchangeable grips.: 78 Offerings in the series are chambered in .40 S&W, .357 SIG, or 9×19mm Parabellum. As of March 2020, only the SP 2022 variant is still listed on the SIG Sauer website. The SIG Pro was marketed as a lightweight and compact alternative to the “legacy” SIG Sauer handguns in an increasingly competitive and budget-oriented law enforcement market.