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 11.5″ 5.56 NATO upper assembly. It features a removable 3-prong flash hider ready to accept a SIG SLH/SLX suppressor. It also includes a receiver extension delete stock adapter so you may mount any folding or static stock or brace that uses a vertical 1913 rail system.