Home / SBR Barrels & Upper Receivers / Sig Sauer / Mcx-Spear Lt Ar Conversion Kit 5.56 Nato - Mcx-Spear Lt Ar Conversion Kit 5.56 Nato 11.5'''' Black
Mcx-Spear Lt Ar Conversion Kit 5.56 Nato - Mcx-Spear Lt Ar Conversion Kit 5.56 Nato 11.5'''' Black
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MSRP
$1,699.99
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Updated
Aug 26, 2026
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Adapts with Any M4/AR15 Spec Lower Assembly
Adjustable Gas System
Ambidextrous Charging Handle with Gas Deflector
Compatible with SLX/SLH Suppressors
Dual Rod Recoil Assembly Eliminates Buffer System
M4 Adapter Allows for Picatinny Rail Folding Stock Capabilities
Quick Change Barrel Design
Tapered Bolt Design
Specifications
Description
This complete kit will convert any MIL-SPEC AR-15/M4 Lower into the top-performing MCX-SPEAR LT. Included items: Complete 11.5" or 16" 5.56 NATO upper assembly includes our removable 3-prong flash-hider ready to accept our SLH & SLX suppressor systems. Receiver extension delete stock adapter so you may mount any folding or static stock or brace which uses a vertical 1913 rail system. Thread pitch 1/2x28 Compatible with the following lowers: MCX, M400, 516, and any MIL-SPEC AR-15/M4. Mfg: Sig Sauer, Inc.
