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Sig Sauer PMPX4BCHNB: The MPX Copperhead features a monolithic Elite Series Cerakote finish upper receiver and a 4.5" barrel with integrated muzzle brake. 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. It features 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.
One Piece Aluminum Upper With M-Lok - Timney Single Stage Trigger - 20rd Poly Mag - Ambi Controls - 4.5 Threaded K Barrel - Caliber 9mm - Frame MATERIAL: Aluminum - Frame FINISH: Anodized - Barrel MATERIAL: Carbon Steel - Barrel FINISH: Nitride - Magazine CAPACITY: 20 Rounds - SIGHTS: Optics Ready - TRIGGER: Timney Single Stage - Overall LENGTH: 22.3 in - Overall HEIGHT: 8 in - Overall WIDTH: 2.4 in - Barrel LENGTH: 4.5 in - Barrel TWIST: 1:10 in - Weight w/MAGAZINE: 4.6 lb