The HK USP Expert is a competition-grade variant of the USP with a 5.2-inch barrel, match-grade trigger, adjustable rear sight, and factory O-ring barrel for enhanced accuracy. It was the first factory-configured competition pistol from HK and remains the most competition-refined USP variant produced. Type: Pistol Action: Double/Single-Action Caliber: 9mm Capacity: 18 Year introduced: 1999, Germany Weight: 30.4 oz Overall length: 9.1" Status: Active Intended use: competition, IPSC, USPSA