Tactical Tailor

SIG SAUER Unveils the Next Evolution in Rifle Technology: The SIG MCX


NEWINGTON, N.H. (January 12, 2015) — SIG SAUER, Inc., continues to set new standards in firearm design, innovation, and performance with the introduction of the SIG MCX™. Designed from the ground up as a short-barreled, silenced, lightweight rifle-caliber system, the SIG MCX has reset the standard for modularity, sound suppression, and mission capability.

With the introduction of the SIG MPX™ submachine gun, SIG SAUER raised the bar for performance and modularity in a pistol-caliber platform. The SIG MCX combines that modularity with rifle-caliber power in a compact package, designed for optimum performance with a silencer.


“We’ve built a team of the best minds in the industry, when it comes to silencer technology, rifle engineering and the .300 Blackout cartridge,” said Jeff Creamer, Executive Director and General Merchandise Manager for SIG SAUER, Inc. “The end result is a technological leap forward in ergonomics, modularity, cartridge performance, and sound reduction.”

Unlike every other firearm on the market, the SIG MCX was designed from the start for optimum performance with the .300 Blackout cartridge and a silencer. When paired with a SIG SAUER silencer, the outcome is a firearm with superior suppression capability and enhanced reliability with both supersonic and subsonic loads.

An auto-regulating gas system makes the transition from subsonic to supersonic seamless. In combat situations, the SIG MCX can run supersonic on the silenced setting without damaging the firearm or negatively impacting reliability.


Sharing a modular design with the SIG MPX, the SIG MCX is a mission-adaptable marvel. Changing between .300 Blackout and 5.56 NATO is as simple as swapping barrels and op rods. Converting to 7.62x39mm simply requires an additional bolt face change. All of this can be performed by the user in the field. Barrel lengths can also be changed, with 16″ and 9″ versions initially available.

“The SIG MCX can be set up as a silenced personal defense weapon or a primary rifle in almost no time at all,” Creamer said. “The one constant is SIG SAUER reliability and durability.”

The SIG MCX features a revolutionary recoil assembly that does not require a buffer tube, allowing for side-folding stocks. A full-length picatinny top rail allows for the mounting of lights or optics. Removable SIG SAUER iron sights come standard.


The lower receiver offers familiar AR-style controls, with ambidextrous selector and mag release as standard. The SIG MCX upper is compatible with mil-spec AR-15 lowers and, with the use of a SIG MCX Stock Kit, allows consumers to fully upgrade their legacy system.

Three variants of the SIG MCX will be available to the commercial market; semi-automatic rifle, short-barrel rifle (SBR) and pistol configurations. All will be available in .300 Blackout, 5.56 NATO or 7.62x39mm, with caliber conversions available immediately.

All SIG MCX models will feature aluminum KeyMod handguards, ambi AR-style controls, an ambi charging handle, and will utilize standard STANAG magazines. Also unique to the SIG MCX is an upper receiver with hardened replaceable wear points, including a cam path wear insert, a feed ramp insert, a removable / replaceable deflector, and charging handle latch point inserts.


The rifle variant will feature a 16″ cold hammer-forged barrel, while the SBR will come with a 9″ barrel. Both will offer a choice of four stocks: a low profile, side-folding skeletonized stock, a telescoping stock, a tubular side folding stock, or a folding telescopic stock. The pistol variant will feature a 9″ barrel and a side-folding SBX Pistol Stabilizing Brace.

The SIG MCX rifle carries an MSRP of $1,866, while the SBR variant has an MSRP of $2,058. The pistol with side-folding SBX has an MSRP of $2,132.

Follow SIG SAUER on social media, including Facebook at www.facebook.com/sigsauerinc, Instagram at www.instagram.com/sigsauerinc, and YouTube at https://www.youtube.com/user/sigsauerinc.


20 Responses to “SIG SAUER Unveils the Next Evolution in Rifle Technology: The SIG MCX”

  1. TCBA_Joe says:

    I don’t get the 9″ bbl.

    • Craig says:

      I think its so you can make it an SBR.

      • TCBA_Joe says:

        You can also make an SBR with a 10.5″ or 11.5″, which is a more common length for it’s better ballistics and compatibility with suppressors. (Most companies won’t warranty their cans for use with <10" barrels)

        To add, the prototype 5.56 guns were 11.5". 9" is good for x39, 300BLK, and 6.8. But for 5.56 that extra inch does help.

        • jb1753 says:

          .300 blk was designed for a 9″ barrel by AAC.

          • DangerMouse says:

            9″ is a sweet spot for .300Blk, but I wonder if AR15 barrels can be adapted to the MCX for those wanting a pinned 14.5″ or an 11.5″ SBR or pistol.

            • tcba_joe says:

              IIRC it uses a different barrel extension.

              9″ is good for the other calibers, but I can’t believe it was picked for 5.56. Hopefully they’ll offer factory bbl lengths. I’d be fine with cutting down the 16″ but the handguard is longer.

  2. Craig says:

    I would very much like to trade in my Sig .556 for a Sig MCX.

  3. Big Al says:

    “The one constant is SIG SAUER reliability and durability.”

    What era are we talking about here? In the last 5 years? The late 1970’s? Makes a difference.

    • SSD says:

      What’s your point?

      • Dellis says:

        I own and shoot several SIG’s. Never had a failure or had one go kaput. In fact my newest P229 has had at least 1200 rounds thru it and not a single hiccup with various ammo.

        Now my experience is only handguns, no rifles……yet!

  4. tazman66gt says:

    Why not make it an ambi bolt release as well, since they made a new lower and all you would think they would make it fully ambi.

  5. reader says:

    Why no carbon fiber handguard?

  6. Popndrop says:

    I’m afraid this will be yet another disappointment from SIG Sauer. Another awesome design that takes years to get to market…
    Much like the long awaited and much vaunted MPX. Hailed by all the blessed gun writers who have held it as the next coming of the messiah – in the form of a Sub Gun. Yet Whose presence is yet to be felt by the common folk anywhere. The date of deliverance has come and gone several times – and the true believers are starting to have doubt in their hearts.

    Learn from your lessons oh powerful and mighty Sig, lest your minions will most certainly fall from your graces and pick up the mantle of yet another gun-deity. Shot show starts in a week and everyone will have cool stuff to lust after…please don’t fail us again.

    • Beretta 1943 says:

      Totally agree – this product has been sold a thousand times before SIG can deliver shit. Put up or shut up SIG – brochureware isn’t going to cut it anymore! Cabelas advertises it – but not there. Cheaper than Dirt advertises it – but none there either. Vaporware made out of nonobtanium… It still has lLOTS of issues folks and they just blew the smoke and flashed the mirrors at the SHOT show to cover the truth that the Emperor has no clothes!

    • Oglee says:

      Just looking over this anda wow. You could not have been more wrong. The MCX is here.

  7. Big G says:

    What optics are on the rifle in the first picture?

  8. Greg says:

    Beretta 1943 – I just bought one today at Cabelas in Glendale, AZ. The counter guy told me they had five initially shipped in and I got the fifth. Can’t wait to shoot it.

  9. Mike Hanley says:

    Took delivery last Thursday of MCX pistol kit. 556/ 300 barrels both included. Would imagine they soon will be widely avaible. about 2200.00

  10. Brian says:

    They have three at cabelas in West Virginia off I70. Columbus is now out