The Daniel Defense RIS III Rail Interface System takes the proven design of our two-piece RIS II rails-used by U.S. Special Operations Command (SOCOM) since 2006-and reduces weight while adding versatility by utilizing M-LOK attachment. You get the same proven free-float barrel design, durable aircraft-grade aluminum construction, and an uninterrupted upper rail platform with Mil-Spec 1913 rail of the RIS II. But you also get seven M-LOK attachment points along the handguard, plus integral QD swivel attachment points on both side. FeaturesFree-Floating Barrel Design for Increased AccuracyM-LOK Attachment at 7 Different Positions Along Length of HandguardAircraft Grade 6061-T6 Aluminum ConstructionProven 6-Bolt Bolt-Up System Securely Attaches Handguard to the Upper ReceiverGrade 8 Military Specification FastenersUninterrupted Upper Rail Platform & Mil-Spec 1913 Picatinny RailBackward Compatible with RIS II Bolt-Up System-Utilizes Same Barrel Nut & Bolt-Up PlateRIS ...