Lena Miculek shows off the SIG MPX full auto suppressed sub machinegun. Like the SIG p320 series, this subgun is modular allowing the user to swap barrels to accommodate 9mm, .357 sig, and .40 S&W ammunition. Barrel length can vary as well with 4.5″, 6.5″, and 8″ options. With fully customization stocks, grips, and handguards, you can make this weapon entirely your own. Called the bastard child of an AR and an MP5, this is the dream weapon for anyone interested in a SBR.