The choice of professionals worldwide, the MPX offers a closed bolt gas piston system that is ultra-reliable and durable. The MPX is modular, allowing for multiple handguard and barrel lengths, and is ready to go for suppressor use. The MPX K now features the SIG PCB folding brace, which helps the K to fold in an ultra-compact size and be operable in the folded position. The K also features an updated M-Lok handguard, which is available as an accessory 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.