The STI Tactical 5.0 in 10mm Auto is a full-size double-stack 2011-pattern pistol from STI (pre-Staccato rebrand) chambered in 10mm for competition and duty use, featuring a 5-inch bull barrel, polymer grip module, and steel frame. Type: Semi-Automatic Pistol Action: Single-Action Caliber: 10mm Auto Capacity: 17 Year introduced: 2005, USA Weight: 40 oz Overall length: 8.5" Status: Discontinued Intended use: competition, law_enforcement, sport