Made of precision machined 6061 aircraft aluminum with premium anodizing. Provides 5 Weaver-Picatinny rails for lights, lasers, bipods, grips, and sights. Customizable two 7 slot and two 9 slot detachable rails and top 4" fixed rail. Net weight with all rails attached is 10.7oz. Innovative 45 degree side mounting base offers extra tactical options. Free float barrel nut is included.