Adding to their extremely successful line of stripped MK18 Daniel Defense uppers, Daniel Defense now has the stripped MK18 upper with their RIII rail! The MK18 RIII(TM) AR15 style Upper Receiver Group is unmatched in size, weight, and performance, and is built around a 10.3 inch Cold Hammer Forged M4 Profile barrel and a carbine length gas system. It features a 9.5 inch lightweight RIS III rail-modeled after the revolutionary RIS II two-piece handguard developed for SOCOM- which features M-LOK attachment for lighter weight. UPPER RECEIVER: Mil-Spec with Indexing Marks and M4 Feed Ramps. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized BARREL: Chro Mfg: Daniel Defense