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Sig Sauer LE/Mil

SIG M400 PRO

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 M400 PRO comes standard with AMBI controls. 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.
SIG WRM400-556N-16B-PRO

Retail: $1,500.00
Price: $1,100.00
You Save: $400.00 (26.7%)
Availability: Out Of Stock / Not Available For Back Orders
Usually ships In : No Current ETA. Join Our Email List for Updates

Manufacturer LE/Mil Program Pricing - Purchaser Must Provide Proof of Eligibility. Please see Eligibility Information tab for Eligibility Requirements.

Order Details

  • Not available where prohibited by law
  • Proof of eligibility is required and we will keep a copy of the eligibility on file.
  • Offer not available in all states
  • All web sales must go through a Federal Firearms Licensee
  • Your order confirmation will contain information on how to submit your qualification credentials and FFL's information
  • Coupon codes/Discount codes not applicable
  • Please check out the Individual Firearms Sales page for more details on the ordering process.
CALIBER B 5.56 NATO
Barrel Length 16.0 in (406 mm)
Mags Included (1) 30rd Gen3 Pmag
Mag Type AR-15
Sights SIG Flip Up Locking
Action Type Semi-Auto
Stock TypeTelescopic
Barrel Material Cold Hammer Forged Carbon Steel
Trigger Type Standard
Trigger Weight
Twist Rate 1:7
Forend Type Alloy
Grip Type Polymer
Receiver Finish Hard Coat Anodized
Overall Length 36.5 in 972 mm)
Overall Width 2.5 in (63.5mm)
Height 7.5 in (2191 mm)
Threads 1/2 in-28 tpi
Accessory Rail M-LOK
Operating System Direct Impingement
Weight 6.5 lb

We are proud to participate in SIG Sauer's Law Enforcement / Military Discount Program which offers many popular SIG weapons at significant discounts to eligible customers. Eligible customers are:

  • Military: Active, Reserve, NG, Retired, Medically Retired, Service-connected Disabled Veteran, and Honorably Discharged
  • Law Enforcement: Federal, State, and Local Active or Retired Sworn Officers
  • Law Enforcement Academy cadets with cerfified enrollment documentation
  • Corrections Officers including Parole and Probation Officers
  • Active 1st Responders: Firefighters, Paramedics, and EMT's
  • Armed Licensed Federal, State, City and Private Security Officers with ID and Documentations
  • Court Judges
  • District and Deputy District Attorneys

You MUST qualify as one of the above to purchase this weapon. In accordance with our manufacturer agreements, we are only permitted to sell LE/Mil program weapons to eligible individuals.