The MRE kit is meant to work with M4 carbines, and accommodates a hard and fast A2 front sight tower with carbine duration fuel system. It extends previous the entrance sight base, offering further rail House for your mounting of tactical add-ons. Contains a few KAC eleven Rib Rail Panels. https://kacrail08529.articlesblogger.com/49614844/5-easy-facts-about-knights-armament-m4-quad-rail-described