The STI Guardian is a 2011-format double-stack 9mm pistol positioned as a duty and carry option in the STI lineup. It features a standard 4.0-inch ramped bull barrel, night sights, and a dehorned frame for snag-free carry. The Guardian brings the reliability of the 2011 platform to the service and carry market without the competition-specific features of the Eagle or Edge. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 17 Year introduced: 2005, USA Weight: 34 oz Overall length: 7.5" Status: Discontinued Intended use: Service, Duty, CCW