The Beretta Px4 Storm is a polymer-frame rotating-barrel pistol representing Beretta's modern compact service pistol design. Its rotating barrel lockup, derived from the Cougar design, provides a smooth recoil impulse and mechanical accuracy advantage. Used by Italian law enforcement and various international police agencies. Type: Pistol Action: Semi-Automatic Caliber: 9mm Parabellum Capacity: 17 Year introduced: 2004, Italy Weight: 27.7 oz Overall length: 7.5" Status: Active Intended use: Law Enforcement, Civilian Defense