Sig Sauer MCX-SURG Suppressed Upper Kit, 5.56mm, FDE

The Sig Sauer MCX-SURG (brand part no. UAMCXA-SURG) is an integrally suppressed upper receiver kit built for the MCX platform, pairing an 11.5-inch barrel with a built-in suppressor system finished in FDE. Sig Sauer designs the MCX-SURG for MCX owners who want to add integral suppression to their existing platform without buying a separate can and mount. The MCX-SURG favors shooters who want a proven, purpose-built suppressed-upper upgrade.

Key Specifications

• Chambered in 5.56mm (.223 Rem/5.56 NATO).
• Wears an 11.5-inch barrel integrated with the suppressor system.
• Measures 28 inches overall.
• Finished in FDE.
• Operates as a semi-automatic action.

Frequently Asked Questions

Is this an NFA item? Yes. As a suppressed component, it's a Title II firearm requiring an approved ATF Form 4 and transfer through an NFA-licensed dealer.

What caliber is it chambered in? 5.56mm.

How does it mount? It doesn’t use a separate thread-on or quick-detach mount. The suppressor is permanently integrated into the upper receiver and barrel assembly.

Buy the Sig Sauer MCX-SURG Suppressed Upper Kit

This is a Title II item regulated under the National Firearms Act. Purchase requires an approved ATF Form 4, no federal transfer tax and transfer through a licensed NFA (SOT/Class 3) dealer, with an extended federal approval wait before delivery. Order through Sig Sauer‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will walk you through the transfer process.