The SIG Sauer P320 RX in 9mm with 4.7-inch barrel, the Reflex optics-ready variant featuring a factory-installed Romeo1 reflex sight on a full-size P320 slide. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 17 Year introduced: 2016, Germany/USA Weight: 28.5 oz Overall length: 8" Status: Active Intended use: Law Enforcement, Competition, Tactical