The 16" variation of the revolutionary MCX platform perfectly suited for all level of shooters.

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

Item# Description Availability Qty
MSRP Price Choose Qty

Back Ordered

1 $2,800.00 $1,999.00

Unlike every other firearm on the market, the SIG MCX was built for optimum performance with the 300BLK cartridge and a suppressor. The outcome is a firearm with superior suppression capability and enhanced reliability with both supersonic and subsonic loads A two-position gas block makes the transition from subsonic to supersonic as fast as flipping the lever. Changing between 300BLK and 5.56 NATO is as simple as swapping barrels and magazines in a matter of minutes. Converting to 7.62x39mm simply requires barrel, magazine, as well as an additional bolt change. Each SIG MCX features an aluminum MLOK or KeyMod handguard, AR-style lower controls and utilizes standard STANAG magazines. A revolutionary recoil system does not require a buffer tube, allowing for side-folding stocks. A picatinny top rail allows for the mounting of lights or optics. Removable SIG SAUER iron sights come standard. The aluminum forend allows for rail sections to be added where they are needed, permitting the attachment of accessories. The lower receiver offers familiar AR-style controls. Completely ambidextrous controls include the safety, magazine release and charging handle.

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.
Barrel Length 16 in (406 mm)
Mags Included (1) 30 rd Aluminum
Mag Type AR-15
Sights SIG Folding
Action Type Semi-Auto
Stock Type Folding Telescopic
Barrel Material Carbon Steel
Trigger Type 2-Stage Match
Trigger Weight
Twist Rate 1:7 (5.56 NATO); 1:5 (300BLK)
Forend Type Alloy
Grip Type Polymer
Receiver Finish Hard Coat Anodized
Overall Length 35.5 in (902 mm)
Overall Width 2.5 in (63.5mm)
Height 8.0 in (203 mm)
Threads 1/2 in-28 tpi (5.56NATO); 5/8 in-24 tpi(300BLK)
Accessory Rail M-LOK
Operating System Gas Piston
Weight 7.9 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, and Service-connected Disabled Veterans
  • 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.

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