Sig Sauer MPX MCX Collapsible Stock

• Compact telescoping design: The stock collapses down to a short profile for easier transport and storage, while still extending quickly when a full shoulder mount is needed.
• Three length-of-pull positions: Multiple settings make it easier to adapt the rifle to different shooting positions, clothing layers, or user preferences for a more consistent fit.
• M1913 interface compatibility: Designed to mount to the receiver’s 1913 interface, it gives MCX and MPX owners a factory-fit solution without adding unnecessary complexity.
• Polymer and aluminum construction: The combination keeps weight under control while providing the rigidity needed for regular range use, training, and general tactical setups.
• Integrated QD sling slots: Quick Disconnect sling compatibility helps build a practical carry setup and makes it easier to transition between transport and shooting use.

About the Sig Sauer Stocks Series

Sig Sauer factory stocks are built around the company’s modular firearm platforms, with a strong focus on fit, compatibility, and practical handling. Within the broader SIG SAUER lineup, these stocks are intended for shooters who want original components designed specifically for rifles and carbines such as the MCX and MPX families, rather than generic aftermarket parts. The emphasis is on maintaining the platform’s intended geometry and mounting interface while giving the user options for storage length, sling setup, and shooting position.

Across the range, the design philosophy is straightforward: keep the stock durable enough for regular field and range use, compact enough for modern carbine handling, and simple enough to operate without distraction. Depending on the model, SIG Sauer stocks may prioritize folding, telescoping, or minimalist construction, but they generally share a focus on modularity and platform-specific installation. That makes them well suited to tactical carbines, competition setups, and general-purpose rifles where overall length, transport convenience, and repeatable shoulder positioning all matter. For shooters building out a SIG platform, the series is aimed at preserving factory integration while improving how the firearm carries and fits in real use.

About the Sig Sauer MPX MCX Collapsible Stock

The Sig Sauer MPX MCX Collapsible Stock is a factory telescoping stock made for shooters who want to keep an MCX or MPX platform compact without giving up the stability of a proper shoulder stock. Its key advantage is the way it shortens the rifle for storage, transport, or movement in confined spaces, then extends when a more settled shooting position is needed. That makes it a practical choice for general use, competition, and tactical applications, especially on carbines where overall length can affect how quickly the firearm is handled.

The stock uses a three-position telescoping system, which gives the shooter room to fine-tune length of pull for body size, clothing, or shooting stance. In practice, that helps create a more natural shoulder position and a more repeatable head placement behind the sights or optic. The design does not use a cheek piece adjustment system, which keeps the profile clean and simple, with fewer protrusions to catch during transport or rapid handling.

Construction combines polymer and aluminum, balancing low weight with the stiffness needed for regular use. At 17.7 oz [1.11 lbs], it adds useful functionality without turning the rear of the rifle into a heavy, bulky assembly. The M1913 attachment type keeps installation aligned with compatible SIG platforms, and the integrated QD swivel slots make it easier to configure a sling for carry or training use. For shooters who want a compact factory stock with straightforward operation, this model focuses on fit, portability, and platform-specific compatibility.

About Sig Sauer

SIG SAUER traces its origins to a wagon factory opened near the Rhine Falls in Switzerland in 1853, giving the brand a long industrial history that predates its modern firearms identity. Today, SIG SAUER, Inc. is headquartered in Newington, New Hampshire, and the company’s product range extends well beyond rifles and pistols to include firearms, electro-optics, ammunition, airguns, and suppressors. That broad manufacturing base is relevant to parts and accessories such as stocks, because the company develops components within complete firearm systems rather than as isolated add-ons.

In the optics field, SIG SAUER produces riflescopes, red-dot sights, and rangefinders, reflecting a wider focus on integrated shooting equipment. The company’s modern identity also took shape when SIGARMS changed its name to SIG SAUER in 2007. For users of MCX and MPX platforms, that system-based approach is important: factory accessories are designed around the same platform logic as the firearms themselves, with attention to compatibility, handling, and intended use.

Main Features

• Manufacturer: Sig Sauer
• Color: Black
• Application: Competition, General, Tactical
• Cheek piece adjustment: No
• Weight: 17.7 oz [1.11 lbs]
• Material: Polymer / Aluminum
• Telescoping: Yes
• Adjustable Positions: 3 Positions
• Attachment Type: M1913
• Sling Attachment Type: Quick Disconnect (QD) Swivel Slots
• Fully Collapsed: 4 and 1/16th"
• Fully Extended: 8"
• Distance between rods: 1"
• Compatible Models: SIG MCX, SIG MCX-SPEAR, SIG MCX-SPEAR LT, SIG MPX

Warranty

2 years. This stock is covered by a two-year warranty period.