Made specifically for the MCX/MPX carbines, that stock is a result of a collaboration between two well-known manufacturers, Sig Sauer and Magpul.
Side Folding-Telescopic Stock, Manufacturer : Sig Sauer + Magpul, Model : MCX/MPX Folding Magpul SL-K Stock and Adapter, Color : FDE
Made specifically for the MCX/MPX carbines, that stock is a result of a collaboration between two well-known manufacturers, Sig Sauer and Magpul.
Set includes a side-folding adapter and a Magpul SL-K stock, which features length adjustment in 6 different positions. This functionality allows you to customize the stock to individual shooter's needs, while the rubber basepad reduce the weapon's recoil for comfortable shooting. In addition, the SL-K has a useful cutout to attach sling.
MIL-SPEC-standard metal adapter is equipped with a Picatinny mount, which fits MCX and MPX rifles perfectly. A button at the top allows you to fold the stock to the side as well, making it easy to store and transport. Thanks to the MIL-SPEC standard, the adapter is compatible with most stocks for the AR-15 (avoid "Commercial" type stocks).