The MPX K offers a closed bolt gas piston system that is ultra reliable and durable. The MPX K is modular allowing for multiple handguard and barrel lengths and is ready to go for suppressor use. It 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 features an updated M-LOK handguard and Timney Trigger. Includes 35rd polymer magazine.