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.

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.

Features:

• 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

Specifications:

• 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