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Sig Sauer WRM400-16B-PRO M400 PRO 5.56mm NATO Rifle with 16" Barrel

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Available on Special Order. *Estimated delivery: Jun 30th 2021

Sig Sauer WRM400-16B-PRO M400 PRO 5.56mm NATO Rifle with 16" Barrel

Our competition fails to realize that a rock-solid foundation only gets you so far. That explains why many of today’s rifles ship with plastic handguards and throwaway furniture, two things not found on the SIGM400 PRO, SIG SAUER’s take on what an AR-15 should be. This carbine comes with the good stuff—all of it—pre-installed. Like a free-floating M-LOK handguard, which promotes accuracy and handling. Or a quality grip and premium, 6-position buttstock with integral QD points. The Enhanced SIG Trigger on the M400 PRO enables the shooter to extract excellent accuracy from the rifle’s lightweight, 16” nitride barrel that is equipped with a SIG Micro-light Gas Block.


  • SKU: WRM400-16B-PRO
  • UPC Code: 798681583690
  • Caliber: .223 / 5.56
  • Manufacturer: Sig Sauer
  • Sights (detailed): Flip-Up Sights
  • Grips: No
  • Frame Finish: Black
  • Barrel Length (in): 16.0 in
  • Rifling: No
  • Mag Capacity / Rounds: 30rd
  • Number of Mags: 1
  • Accessory Rail: Yes
  • Features: No

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