The MRE kit is designed to get the job done with M4 carbines, and accommodates a set A2 front sight tower with carbine size gas process. It extends past the entrance sight foundation, providing additional rail Place for your mounting of tactical extras. Involves three KAC eleven Rib Rail Panels. https://kac-rail96307.liberty-blog.com/26788010/the-knights-armament-m4-quad-rail-diaries