Sig Sauer MPX K 4.5" SBR NFA Class III 9mm MLOK Folding stock New PDW

The SIG Sauer MPX K is a compact pistol-caliber carbine built on the MPX platform with a 4.5 inch barrel and gas-operated short-stroke piston operating system. It ships with a 30-round magazine and features a KeyMod handguard with attachment points for accessory rails and a Picatinny top rail for sights or optics. The MPX K includes an ambidextrous fire control selector (SAFE/SEMI or SAFE/SEMI/AUTO depending on model), flip-up front and rear folding sights as standard, and a folding/telescoping buttstock on applicable configurations. The design includes a threaded muzzle with a screw-on flash suppressor and a short sight radius appropriate for close-quarters and professional use.