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. This item includes a complete 9″ 300BLK upper assembly. It features a removeable 3-prong flash-hider ready to accept a SIG SLH/SLX suppressor. Receiver extension delete stock adapter so you may mount any folding or static stock or brace that uses a vertical 1913 rail system.