The EMP 4 extends the Enhanced Micro Pistol to a 4-inch barrel configuration, adding velocity and a longer sight radius while retaining the purpose-designed 9mm frame. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 10 Year introduced: 2016, USA Weight: 27 oz Overall length: 7.5" Status: Active Intended use: Concealed Carry, Personal Defense