Selected by USSOCOM for its superior performance and reliability
This 11.5 inches 5.56x45mm MCX upper receiver group comes in a distinctive FDE finish
The direct thread model weighs just 1.49 lb and features a 7.3 inches reduced blowback design
The 5.56 suppressor is equipped with a titanium heat shield for enhanced durability and performance
It includes a lightweight low-profile handguard and an SD handguard with an integrated heatshield
An adapter kit for standard M4 lowers is included for versatile compatibility
The folding stock comes with an adapter kit for easy attachment and removal
A removable titanium cage is featured on the SD handguard for added durability
This is a class 3 item (NFA), requiring appropriate registration and regulation

Features

Introducing the Sig Sauer MCX-SURG (Suppressed Upper Receiver Group) Upgrade Kit, designed to meet the rigorous requirements of USSOCOM. Engineered for extreme performance, the MCX-SURG delivers unparalleled accuracy and durability in-specialized operations. This upgrade kit seamlessly converts any standard M4A1 lower into a next-generation MCX platform. Featuring Sig Sauer's advanced suppressor technology, the MCX-SURG has undergone rigorous testing in the most demanding Special Operations conditions, surpassing stringent standards for durability, accuracy and sound reduction. Its unique heat shield design ensures operator safety during high-rate fire operations. The MCX-SURG Upgrade Kit includes a complete MCX upper receiver group, a direct thread Inconel suppressor with a removable titanium cage, SD handguard, low-profile handguard and a folding stock with adapter kit. Chambered in 5.56x45mm, this kit offers unmatched performance and adaptability for specialized operations.

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Shipping Restrictions

It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.