Sig Sauer MPX 9mm SBR Rifle with Collapsible Stock - MPX-4B-9-KM-SBR

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Sig Sauer MPX 9mm SBR Rifle with Collapsible Stock - MPX-4B-9-KM-SBR

 Sig Sauer MPX PSB 9mm SBR, 30 Round. Unconventional design. Unmatched performance. The SIG MPX redefines the submachine gun category with a new level of operator safety, in-field adaptability and proven reliability in the harshest enviroments. There's nothing else like it. And it is only available from SIG.


  • Caliber: 9mm
  • Operating System: Semi-Auto
  • Action Type: Closed, fully-locked short stroke pushrod gas system
  • Overall Length: 16.1 in
  • Rifling Type: 1:10
  • Barrel Length: 4.5 in
  • Stock Type: Collapsible
  • Handgun Material: Aluminum mono rail
  • Mag Capacity: 30 Rounds
  • Trigger Type: AR Style
  • Trigger Pull: 7.6 lb

Please Note:

The following states have restrictions on "high capacity" magazines:

  • 10 Round- CA, MA, MD, NY, HI
  • 15 Round- NJ
  • We cannot ship to these states unless purchased by a Law Enforcement Agency

Gun Sales Are Permitted To Public Safety Only:

  • Sworn Law Enforcement officers, including Federal, State, County, & City (Includes retired L.E. officers with "retired" credentials)
  • EMT's, Fire Fighters, Volunteer Fire Fighters, and Paramedics
  • Military personnel including Reservists and National Guard with I.D. (Includes retired Military with "retired" credentials)
  • Military veterans medically and honorably discharged with retired ID or DD-214
  • Corrections Officers, including Parole and Probation Officers
  • State Licensed Security Companies (Loomis, RAM, etc.) also includes State Licensed Armed Security Officers
  • Court Judges, District Attorneys and Deputy District Attorneys
  • LE Academy Cadets with enrollment documentation from the Academy

Please See our FAQ on ordering a Gun