The SIG Sauer MPX Copperhead was specially designed to meet the ever-changing needs of the special operations community. This semi-automatic platform is designed to work on the clean-running gas piston system. The MPX Copperhead is built to run all weights and brands of 9mm Luger ammunition without having to adjust the gas valve because of the short-stroke gas piston system. This gun operates from a fully closed and locked rotating bolt which offers you enhanced reliability and safety during use. This particular model features the SIG Sauer Single Stage Polished trigger, PCB Pistol stabilizing brace, and MPX specific magazines.