The Knights Armament Company MRE Free Float RAS Rail was designed to work with M4 carbines and accommodates a fixed A2 front sight tower with carbine length gas system. The MRE Free Float RAS features full length Mil-Spec M1913 Picatinny rails at the 12, 3, 6, and 9 o'clock positions, making it compatible with any number of rail-mounted tactical accessories. the MRE RAD extends past the front sight base, providing additional rail space for the mounting of tactical accessories. Includes three KAC 11 Rib Rail Panels. Made from Aluminum with Black Anodizing finish.