The SIG MCX is a weapon series designed and manufactured by SIG Sauer, featuring a short-stroke gas piston system, carried over from the SIG MPX submachine gun. It is made in both semi-automatic and selective fire configurations. It is available in rifle, short-barreled rifle, and pistol configurations.
Built at SIG's New Hampshire factory, the MCX was "engineered from the ground up to be silenced, light and short" according to a SIG Sauer brochure.
In 2016, SIG recalled some weapons with the first generation bolt carrier group.

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  1. mrbigglsworth

    MCX 16": How to lighten the load

    The Sig MCX is a unicorn: an AR15 pattern rifle with a piston system that makes god cry. Is is beauty incarnate, and it is mine. It is also heavy as fuuuuu- The gun weighs in at 7.9lbs in the nude. Damn, that's a heavy 16" 5.56 carbine. I know I know, "the MCX is a piston gun! It's not...
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