What sets the M4 RAS apart from other 2-piece quad rails available is that it securely locks for the rifle’s barrel nut through a clamp and screw arrangement, rendering it a really strong foundation on which to mount tactical add-ons. Features 3 KAC 11 Rib Rail Panels. For other rib https://knightsarmamentm4quadrail32974.theblogfairy.com/26354405/the-definitive-guide-to-kac-ras-rail