The choice of professionals worldwide the MPX K offers a closed bolt gas piston system that is ultra reliable and durable. As with all MPX the K is modular allowing for multiple handguard and barrel lengths and is ready to go for suppressor use. For 2019 the K now features the SIG PCB folding brace which allows the K to fold into an ultra-compact size and be operable in the folded position. The K also features an updated M-Lok handguard which is available as accessories in multiple lengths for suppressor coverage. Finally the K is upgraded with the ultra smooth ultra-fast Timney Trigger. Co-designed by Timney and SIG this trigger offers the Timney performance you have come to expect we with the ultimate reliability to make it survive the punishment of a sub gun platform. If you are looking for the ultimate modular sub gun look no further than the MPX K from SIG SAUER. - OPERATING SYSTEM: Gas Piston - CALIBER: 9mm Luger - STOCK TYPE: PCB - BARREL MATERIAL: Cold Hammer Forged Carbon Steel - TRIGGER TYPE: TIMNEY Single Stage - FOREND TYPE: Alloy - GRIP TYPE: Polymer - RECEIVER FINISH: Hard Coat Anodized - OVERALL LENGTH: 22.25 in (565 mm) - OVERALL WIDTH: 2.4 in (61 mm) - HEIGHT: 8 in (203 mm) - BARREL LENGTH: 4.5 in (114 mm) - THREADS: M13.5 x 1 mm - ACCESSORY RAIL: KeyMod - WEIGHT: 5 lb (2.3 kg) - TWIST RATE: 1:10 - MAG TYPE: MPX - MAGS INCLUDED: (1) 30rd Polymer Mag