The MPX Copperhead features a monolithic Elite Series Cerakote® finish upper receiver with an integrated stock knuckle lower and a 3.5” barrel with integrated muzzle brake. The MPX Copperhead comes equipped with the new SIG SAUER Pivoting Contour Brace (PCB) giving pistol users a brace that easily adapts to the movement of the shooter’s arm with a patented swivel operation for perfect placement and can be rapidly deployed. – Unconventional design unmatched performance and familiar AR handling. The SIG MPX redefines the submachine gun category with a new level of operator safety in-field adaptability and proven reliability in the harshest environments. Completely ambidextrous the SIG MPX is great for left- or right-handed shooters with its dual-sided selector switch magazine release charging handle and bolt release. The SIG MPX operates from a fully-closed and locked rotating bolt offering enhanced reliability and safety in use. A short-stroke gas piston allows the SIG MPX to run all weights and brands of 9mm ammunition with no adjustments to the gas valve. – OPERATING SYSTEM: Gas Piston – CALIBER: 9mm Luger – OVERALL LENGTH: 14.5 in (368 mm) – OVERALL WIDTH: 2.4 in (61 mm) – HEIGHT: 8 in (203 mm) – BARREL LENGTH: 3.5 in (89 mm) – WEIGHT: 4.5 lb (2 kg) – TWIST RATE: 1:10 – MAGS INCLUDED: (1) 20rd Polymer Mag – MAG TYPE: MPX – STOCK TYPE: PCB – BARREL MATERIAL: Carbon Steel – TRIGGER TYPE: Single Stage Polished/Hard-Coat – FOREND TYPE: Alloy – GRIP TYPE: Polymer – RECEIVER FINISH: Cerakote – ACCESSORY RAIL: M1913