Sig Sauer - MCX-SURG - Suppressed Upper Receiver Group - *UPDATED*

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Expected release date is 26th Jan 2024

MSRP: $4,599.99
Now: $3,999.99
Was: $4,099.99
— You save $600.00
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***UPDATED*** Preorder -  These are incoming any day, currently on Form3 from Sig Sauer waiting for NFA approval, and then they will be on their way to

SIG SAUER is proud to introduce the MCX-SURG (Suppressed Upper Receiver Group) Upgrade Kit. Designed to meet the highly-specialized needs of USSOCOM, the MCX-SURG Kit was developed to deliver extreme performance for special operations units while maintaining high-levels of accuracy and durability.

The MCX-SURG Upgrade Kit was specifically engineered as a drop-in upgrade for a standard M4A1 lower, converting any standard Mil-Spec AR rifle into a next-generation MCX. Utilizing SIG SAUER’S advanced suppressor design the MCX-SURG has been tested under Special Operations harshest, most demanding conditions, and has been proven to exceed even the most extreme durability, accuracy and sound reduction standards.

*LIMITED RUN* The unique heat shield design of the MCX-SURG Upgrade Kit, is meant to prevent burns while still allowing the operator to maintain high rates of fire

The MCX-SURG includes a complete MCX upper receiver group, direct thread Inconel suppressor, removable titanium cage, SD handguard, low profile handguard, folding stock with adapter kit, and chambered in 5.56 NATO.


  • Selected By USSOCOM
  • 11.5” 5.56 MCX Upper Receiver Group FDE
  • DIRECT THREAD 1.49 lbs 7.3“ Reduced Blow Back
  • 556 Suppressor With Titanium Heat Shield
  • Includes Lightweight Low-Profile Handguard and SD Handguard With Heatshield
  • Includes Adapter Kit For Standard M4 Lower


  • Model: Sig Sauer MCX Upper
  • Barrel: 11.5" Cold Hammer-Forged Carbon Steel
  • Barrel Finish: Chrome
  • Caliber: 5.56x45 NATO
  • Finish: Flat Dark Earth Anodized/IR CERAKOTE
  • Muzzle: Inconel Suppressor
  • Stock: Folding Stock Adapter Kit
  • Handguard: Removable Titanium Cage - SD Handguard
  • Class 3 Item (NFA)

*Please note a 25% restocking fee applies to canceled pre-orders, covering administrative costs and potential sales loss. Your understanding is appreciated. Contact us with any questions.

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