Sig Sauer - MCX-SURG - Suppressed Upper Receiver Group - Preorder

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Expected release date is 26th Jan 2024

MSRP: $4,599.99
— You save $500.00
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***UPDATED*** Preorder - Expected release date is 1/26/2023 *** 

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
  • Muzzle: Inconel Suppressor
  • Stock: Folding Stock Adapter Kit
  • Handguard: Removable Titanium Cage - SD Handguard
  • Class 3 Item (NFA)
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