The STI Eagle 5.1 in 9mm is one of the defining competition pistols of the 1990s and 2000s IPSC Open division. Built on STI's proprietary 2011 modular frame system — a double-stack 1911 format with polymer grip module and steel frame rails — the Eagle 5.1 features a 5.1-inch bull barrel, adjustable rear sight, fiber-optic front sight, and a single-action trigger. The 9mm version was dominant in IPSC Open before the widespread adoption of 38 Super. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 17 Year introduced: 1994, USA Weight: 38 oz Overall length: 9" Status: Discontinued Intended use: IPSC Open, IPSC Limited, Competition