The Sig Sauer MCX/MPX Folding Stock (brand part no. 8901412) is a black aluminum stock built to install directly onto the MCX and MPX platform’s 1913 receiver interface. Sig designed this folding visor-style stock to shrink the overall footprint of the weapon for storage or transport without giving up a solid cheek weld when it’s deployed. The hinge is built to lock the stock open in the firing position, so there’s no wobble or play once it’s extended. It’s a straightforward, purpose-built upgrade for MCX and MPX owners who want a compact folding option without hunting for aftermarket adapters.

Key Specifications

• Attaches via the 1913 receiver interface for direct installation on MCX/MPX platforms.
• Features a folding visor-style design that reduces overall length for storage and transport.
• Hinge locks the stock open in the deployed position for a stable firing platform.
• Constructed from aluminum for a durable, lightweight build.
• Finished in black to match factory MCX/MPX furniture.

Frequently Asked Questions

Does the stock lock open when deployed? Yes, the hinge locks the stock open in the deployed position for a stable cheek weld.

Which platforms is this stock built for? It is designed to install on the Sig Sauer MCX and MPX platforms via the 1913 receiver interface.

Buy the Sig Sauer MCX/MPX Folding Stock

Shrink your MCX or MPX’s footprint without losing a solid, locked-open cheek weld. Order it from our Sig Sauer lineup of rifle stocks as soon as it’s ready to ship from our Lubbock, Texas gun shop.