Sig Sauer Collapsible Picatinny Stock Assembly for MPX/MCX - Black

The Sig Sauer Collapsible Picatinny Stock Assembly is the factory-engineered telescoping stock built specifically for MCX and MPX platforms. If you run either of these Sig rifles and want a stock that matches factory specs and integrates seamlessly with your receiver's 1913 Picatinny interface, this is your straightforward solution. It installs directly onto the receiver's standard mounting point with no gunsmithing required.

What sets this stock apart is its three-position length-of-pull adjustment. Whether you're shooting in body armor, layered clothing, or need a shorter cheek weld for optics clearance, you can dial in the fit that works for your setup. The black finish matches the standard Sig color and holds up to regular field use. This is the real deal—the same stock Sig engineers designed for these rifles from the factory.

Built for shooters who want their rifle to adapt to their body and gear, not the other way around. If you're running an MCX or MPX for home defense, tactical training, or precision rifle work, a proper-fitting stock makes a real difference in control and follow-up shots.

Key Features

• Three positions of length-of-pull adjustment for variable fit
• Mounts directly to receiver 1913 Picatinny interface—no modifications needed
• Factory Sig Sauer design engineered for MCX/MPX compatibility
• Black anodized finish

Specifications

Frequently Asked Questions

Will this stock fit my MCX or MPX?

Yes. This is the factory Sig Sauer collapsible stock designed specifically for MCX and MPX rifles. It mounts via the receiver's 1913 Picatinny interface.

How many length-of-pull settings does it have?

Three positions. You can adjust the stock to fit your body, gear, and shooting style without removing it from the rifle.

Does it require gunsmithing to install?

No. It installs directly onto the receiver's standard 1913 Picatinny mounting point with no modifications needed.

What's included?

The stock assembly itself. Installation onto your MCX or MPX receiver is straightforward and requires no additional parts.