The PX4 Storm Special Duty is a full-size variant built to SOCOM Special Operations Forces Pistol competition specifications, chambered in .45 ACP with a threaded barrel for suppressor use, extended magazine, ambidextrous controls, and enhanced frame rail for light mounting. The most tactically configured PX4 variant in the standard product lineup. Type: Semi-Auto Pistol Action: Double-Action/Single-Action Caliber: .45 ACP Capacity: 9 Year introduced: 2006, Italy Weight: 31 oz Overall length: 8.05" Status: Active Intended use: defense, duty, military