Compact variant of the SIG M17 adopted by the US military in 2017 under the Modular Handgun System program. Chambered in 9mm with a 3.9" barrel. Issued with both a 17-round flush-fit magazine and a 21-round extended magazine as standard government issue. The M18 replaced the Beretta M9A1 in compact/carry roles across the services. Features a manual safety per military specification — absent on most civilian P320 variants. Type: Pistol Action: Semi-Automatic Caliber: 9mm Luger Capacity: 17 Year introduced: 2018, United States / Germany Weight: 26 oz Overall length: 7.4" Status: Active Military use: Yes Intended use: home_defense, duty