The PX4 Storm Special Duty is the full-size, extended-barrel .45 ACP competition and duty variant. The 5-inch barrel adds muzzle velocity and extends the sight radius. It features a Picatinny rail, an extended and threaded barrel option, and aggressive grip texture. The Special Duty was developed for the US Joint Combat Pistol program evaluation. Type: Pistol Action: Semi-Automatic Caliber: .45 ACP Capacity: 9 Year introduced: 2007, Italy Weight: 28.2 oz Overall length: 8.1" Status: Active Military use: Yes Intended use: Military, Competition, Tactical