The MRE package is made to get the job done with M4 carbines, and accommodates a fixed A2 entrance sight tower with carbine length gas procedure. It extends past the front sight base, giving further rail Area for your mounting of tactical extras. Involves three KAC 11 Rib Rail Panels. https://knights-armament-rail98418.bloggerbags.com/31861082/5-essential-elements-for-kac-rail