The SIG P320 is a modular striker-fired pistol featuring a removable serialized chassis that allows the frame size, slide length, and caliber to be changed by the user. Adopted by the US military as the M17 and M18, it represents the current generation of US service pistol design and has achieved widespread law enforcement and civilian adoption. Type: Pistol Action: Semi-Automatic Caliber: 9mm Parabellum Capacity: 17 Year introduced: 2014, USA Weight: 29.4 oz Overall length: 8" Status: Active Military use: Yes Intended use: Military, Law Enforcement, Civilian Defense