The SIG Sauer MPX is a gas-operated submachine gun primarily chambered in 9×19mm. It is the first submachine gun to feature a fully closed and rotating bolt and piston system.

The weapon, in its second generation, features a system that would allow for conversion from 9mm to .357 SIG or .40 S&W.

SIG Sauer used the same gas piston system to develop the SIG Sauer MCX carbine.

  • KAK Sig MPX / MCX Buffer Tube Adapter

    KAK Sig MPX / MCX Buffer Tube Adapter

    Enables the addition of an aftermarket arm brace or other pistol buffer tube accessory Adapter is made of 6061 T6 aluminum, flat black anodized If using a carbine style castle nut buffer tube there are two threaded alignment holes (10x32 thread) for...

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