Sig Sauer P320 X Pro FS 9mm Luger 4.7in Black Pistol – 10 1 Rounds – With its unmatched modularity, unprecedented accuracy, and uncompromising reliability, the state-of-the-art SIG SAUER P320 has quickly become one of the most sought after firearms on the market today. Chosen by all branches of the U.S. military, as well as law enforcement agencies across the country and around the world, the P320 redefines the modern handgun.