The STI Sentinel 9mm is a compact 2011 platform pistol built for carry use with competition DNA. Single-action trigger, 3-inch bull barrel, and 2011 ergonomics in a compact form factor suitable for concealed carry. Type: Semi-Auto Pistol Action: SA Caliber: 9mm Capacity: 15 Year introduced: 2010, USA Weight: 28.5 oz Overall length: 6.5" Status: Discontinued Intended use: Competition, Carry, Defense