Collapsing Stock for the Sig MCX / MPX

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The Innovative Arms collapsing stock is designed for the Sig MCX / MPX with rear mount picatinny rails. It is machined from billet aluminum and your choice of either steel or titanium rails. This stock installs via the factory 1913 interface and factory collapsing stock mount.

This stock has several options to choose from: LOP positions, material choices for the rail, and butt plate color options.

*Be sure to look over each option carefully when ordering. 

*Stock mount not included. This stock is installed by using your factory collapsing stock mount.


Two length of pull options:

  • Three Position
  • Five Position

Two material choices for the rail:

  • Steel¬†
  • Titanium

The steel rails are black oxide, and the titanium rails are in the raw titanium color.

Butt plate color:

  • Black
  • OD Green
  • FDE
  • Brushed Stainless
  • Burnt Bronze

The butt plate is Black, hard coat anodized aluminum. The color choices are applied over the anodized finish.

Additional information


Three Position, Five Position

Rail Material

Steel, Titanium

Button Stock Color

Black, OD Green, FDE, Brushed Steel, Burnt Bronze