The SIG Sauer P320 is a modular semi-automatic pistol manufactured by SIG Sauer, Inc. This weapon features a versatile and adaptable design, allowing users to interchange grip modules and calibers as needed.Main Features of the SIG Sauer P320: Type: semi-automatic pistol. Caliber: Available in 9 mm, .357 SIG, .40 S&W, and .45 ACP. Capacity: Up to 17 rounds in 9 mm caliber. Barrel length: 11.9 cm.Overall length: 20.3 cm.Weight: 836 g.Grip: Modular polymer.Trigger system: SAFE ACTION.Modular design: Allows for easy interchangeability of grip modules and calibers .The P320 was introduced to the market in 2014 and has been adopted by various security and military forces due to its reliability and ease of customization .