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Description The Daniel Defense DD4 RIII Complete Upper Receiver is an excellent choice for those looking to upgrade their AR-15 rifle with a high-performance upper receiver group. This upper receiver features a 16″ Cold Hammer Forged Government Profile barrel, a mid-length gas system, and a 12.5″ lightweight RIS III rail. In addition, the DD4 RIII Complete Upper Receiver includes a GRIP-N-RIP Charging Handle, which allows for quick but precise rapid fire, and is known for having a smoother recoil impulse, adding to this upper’s accuracy. The upper receiver group is built with the same quality and attention to detail that Daniel Defense is known for, making it a reliable and durable choice for any shooter. Specifications: Model: DD4 RIII URG Type: Accessory-uppers Caliber: 223 Rem | 5.56 NATO Finish: Matte Black Finish Type: Black Barrel: 16″ Government Rate-of-twist: 1-in-7″ Sights: No Sights Sight Type: None Thread Pattern: 1/2×28 Special Feature: Threaded Barrel Shipping Weight: 5.65 Lbs. Addl Info: FDE RIS III 12.5″ M-lok Rail Addl Info: Mid-length Gas System Addl Info: Grip-n-rip Charging Handle