Ships factory-mounted with SIG Romeo Zero red dot optic. The Romeo Zero slide cut is integral, resulting in a lower optic height than adapter-plate solutions. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 10 Year introduced: 2019, Germany/USA Weight: 17.8 oz Overall length: 5.8" Status: Discontinued Intended use: Concealed Carry, Personal Defense