Caliber: 9×19mm Parabellum.357 SIG.40 S&W.45 ACP Barrel length: 120 mm (4.7 in) P320 Full Size; 98 mm (3.9 in) P320 Carry; 98 mm (3.9 in) P320 Compact; 91 mm (3.6 in) P320 Subcompact Designed: 2014 Action: Short recoil operated, locked breech SIG Sauer System In service: 2014–present Manufacturer: SIG Sauer Inc., Exeter, New Hampshire, U.S. SIG Sauer GmbH, Eckernförde, Germany Muzzle velocity: 1198 ft/s (365 m/s)
The SIG Sauer P320 is a modular semi-automatic pistol made by SIG Sauer, Inc., the company's American branch. It is a further development of the SIG Sauer P250, utilizing a striker-fired mechanism in lieu of a double action only hammer system. The P320 can be chambered in 9×19mm Parabellum, .357 SIG, .40 S&W, .45 ACP, and 10mm Auto and can be easily converted from one caliber to another; a change from .357 SIG to .40 S&W requires only a barrel change; a change between 9mm to .357 SIG or .40 S&W and vice versa are accomplished using a caliber exchange kit. The P320 chambered in 9×19mm Parabellum was introduced in the North American market on 15 January 2014, followed by the .45 ACP compact model at the SHOT Show in January 2015.[2] On 19 January 2017, it was announced that a customized version of the SIG Sauer P320 had won the United States Army's XM17 Modular Handgun System competition. The full-sized model will be known as the M17 and the carry-sized model will be known as the M18
