Maxim Defense CQB Stock for SIG MPX and MCX


Maxim Defense recently announced that the company was now making its CQB Stock for the SIG SAUER MPX and MCX platforms. This new stock is a variation of the existing CQB Stock that the company currently manufactures for the AR platform.

The new stock weighs between 17.5 – 17.7 ounces depending on which model you purchase. (The MPX and MCX models are not interchangeable.) It is made of 7075 T6 aluminum and has a black finish. It collapses down to only 4.2″ and pulls out to 9″ when fully extended. The stock has three positions between the extremes giving the shooter a choice of five different lengths from which to shoot.


The stock has a QD socket for the addition of a sling. Additionally, Maxim Defense includes a D-ring with the stock if you prefer to mount a sling with it.

Maxim Defense has not announced a suggested retail price yet. For a ballpark estimate, however, the AR platform stocks range in price from $395 – $550. I would expect the SIG SAUER stocks to be less costly due the lack of buffer tube and additional parts needed on the AR guns. Since the SIG guns are pistol driven, there is no buffer tube on them and these stocks look like they can just bolt up to the butt of the receiver.

Richard Johnson

An advocate of gun proliferation zones, Richard is a long time shooter, former cop and internet entrepreneur. Among the many places he calls home is


  • Patrick Karmel Shamsuddoha

    why not use the spaces cut into the side of the upper to tuck the guide rods in …… grumble

    • EdgyTrumpet

      Because they would have to design a new stock instead of recycling the one they already make.

  • FearlessFarris

    Sig already makes a collapseable stock for the MPX platform. The Sig version also utilizes the integrated channels in the firearm, which, IMO makes it the superior choice. Maxim stocks are excellent products, but I’m not sure what the market for this is. It would have made more sense for them to offer their collapseable “arm brace” version of the stock.


      Agreed 100% i have both in the sbr and the function and fit are amazing .


    • lawbob

      I think their stock is quite a bit lighter…the SIG version has thick steel rods. Could be wrong…


    I dont see the reason for this since the Sig mpx/mcx slide stocks are built tuff and imo look better then these .

  • lowbob

    what’s pistol driven?
    “Since the SIG guns are pistol driven, there is no buffer tube on them and these stocks look like they can just bolt up to the butt of the receiver.”

    I think you mean since the mainspring is above the bolt rather than behind the bolt, a SIG MCX/MPX do not have a buffer tube behind the receiver.

    • JumpIf NotZero

      Piston. Typical proofreading.

      But… What’s even worse is that piston driven doesn’t even sort of mean there is no buffer tube. See almost every piston AR. And that you can have DI guns with no buffer tube, see Olympic AR pistols.

      Not good writing.

      • int19h

        Extar EXP-556 is another example of a DI gun with the spring placed above the bolt (and hence no buffer tube).

  • One of the primary benefits of the MCX rifle is that is has a folding stock without buffer tuber.

    Why would you then slap on an AR PDW stock – to make it longer for transport?

  • Treyh007

    Eewwww…….. another $400+ uncomfortable PDW stock! I tried the Troy version at a local run and gun and was not a fan. nothing against Troy it was the stock itself I couldn’t get use too. It does have a purpose just not for me.