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  • MCX-SPEAR LT 11.5 UPPER AR CONVERSION KIT 5.56 NATO -
  • MCX-SPEAR LT 11.5 UPPER AR CONVERSION KIT 5.56 NATO -
  • MCX-SPEAR LT 11.5" AR CONVERSION KIT 5.56 NATO-BLACK - SIG WUAMCXA-556N-11B-LT
  • MCX-SPEAR LT 11.5" AR CONVERSION KIT 5.56 NATO-BLACK - SIG WUAMCXA-556N-11B-LT
  • MCX-SPEAR LT 11.5" AR CONVERSION KIT 5.56 NATO-BLACK - SIG WUAMCXA-556N-11B-LT
  • MCX-SPEAR LT 11.5" AR CONVERSION KIT 5.56 NATO-COYOTE - SIG WUAMCXA-556N-11B-LTCY
  • MCX-SPEAR LT 11.5" AR CONVERSION KIT 5.56 NATO-COYOTE - SIG WUAMCXA-556N-11B-LTCY
  • MCX-SPEAR LT 11.5" AR CONVERSION KIT 5.56 NATO-COYOTE - SIG WUAMCXA-556N-11B-LTCY
  • MCX-SPEAR LT 11.5" AR CONVERSION KIT 5.56 NATO-COYOTE - SIG WUAMCXA-556N-11B-LTCY
  • MCX-SPEAR LT 11.5" AR CONVERSION KIT 5.56 NATO-COYOTE - SIG WUAMCXA-556N-11B-LTCY
  • MCX-SPEAR LT 11.5" AR CONVERSION KIT 5.56 NATO-COYOTE - SIG WUAMCXA-556N-11B-LTCY
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Sig Sauer

MCX-SPEAR LT 11.5 UPPER AR CONVERSION KIT 5.56 NATO

    The MCX SPEAR LT developed for the SF community is the most advanced platform of its kind. Convert any M4/AR15 platform into a modernized folding firearm with superior reliability, durability, and accuracy.

    Included items:

    • Complete 11.5" 5.56 NATO upper assembly includes our removable 3-prong flash-hider ready to accept our SLH & SLX suppressor systems.
    • (1) SIG 2401191-R: MCX STOCK ADAPTER KIT
    • (1) SIG ADAPTER-X-FOLD: Stock Adapter - 1913 Interface Folding Knuckle
    • Includes SIG Flip Up Iron Sights


    NFA DISCLAIMER/WARNING:Upper receiver does not meet the 16" minimum barrel length requirement, and requires registration and a tax stamp with the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE) when assembled into a complete rifle. Additional state and local restrictions may apply. It is the sole responsibility of the buyer to comply with any and all applicable laws.




    Item# Description Availability Qty
    Break    		 MSRP Price Choose Qty
    SIG WUAMCXA-556N-11B-LT
    UPPER, SIGMCX, 5.56 NATO, 11.5IN, BLK, SEMI, LT, MLOK, FOLDING KNUCKLE, M4 ADAPTER,
    		 Out Of Stock / Not Available For Back Orders 1 $1,999.00 $1,749.00
    SIG WUAMCXA-556N-11B-LTCY
    UPPER, SIGMCX, 5.56 NATO, 11.5IN, COY, SEMI, LT, MLOK, FOLDING KNUCKLE, M4 ADAPTER

    In Stock

    		 1 $1,999.00 $1,749.00
    • Adapts with any M4/AR15 Spec Lower Assembly
    • Dual Rod Recoil Assembly Eliminates Buffer System
    • M4 Adapter allows for Pic Rail Folding Stock Capabilities
    • Adjustable Gas System for Suppressor Optimization
    • Quick Change Barrel Design allows to easily swap calibers and barrel lengths
    • Gas Piston Design Reduces Part Exposure to Carbon Fouling
    • Designed to go 20k rounds before any part replacements
    • SLX/SLH Next Gen Suppressor Designed QD Flash Hider for Clutch-Lok Adaptability
    • Ambidextrous Charging Handle with Gas Deflector
    • Replaceable parts (Cam Path Follower, Feed Ramp, Forward Assist/Deflector, Charging Handle Locking Pins) allow for longer receiver life over standard AR designs.
    • Tapered Bolt Design Functions More Reliably and Lasts Longer than standard Square Lug M4 Bolt Designs.
    • Nitride Coated Cold Hammer Forged Barrel for optimal accuracy and barrel life
    • Thread pitch 1/2x28
    SKU SIG MCX-SPEAR LT
    Barrel Extension MCX
    Barrel Length
    		 11.5"
    Barrel Profile
    		Medium
    Barrel Rifling Type
    		Hammer Forged
    Bolt Carrier Finish
    		DLC
    Bolt Carrier Group Included
    		Yyes
    Caliber5.56 Nato
    Chrome Lined Barrel Yes
    Color Black & Coyote
    Forward Assist Yes
    Free Floated Handguard Yes
    Handguard Length 10.23-in
    Handguard Inside Diameter 1.48 in
    Handguard Material Aluminum
    Muzzle Device 3-Prong/SIG Suppressor QD
    Muzzle Thread Pitch 1/2-28
    Operating System Gas Piston
    Receiver Finish Black Anodized & Coyote Anodized
    Twist Rate 1.7

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