The MRE package is built to get the job done with M4 carbines, and accommodates a fixed A2 front sight tower with carbine length fuel system. It extends earlier the entrance sight base, providing additional rail space with the mounting of tactical accessories. Includes 3 KAC eleven Rib Rail Panels. https://knightsarmamentm4quadrail29629.wizzardsblog.com/26752290/the-greatest-guide-to-kac-m4-ras