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 1/2×28 Compatible with the following lowers: MCX, M400, 516, and any MIL-SPEC AR-15/M4. Mfg: Sig Sauer, Inc.
