Daniel Defense Bolt-Up System Barrel Nut Md: 01-002-07234-131 The Daniel Defense Bolt-Up System Barrel Nut is designed to work with the Bolt-Up Plates used in mounting the RIS II, DDM4 Rail™, AR15 Lite Rail™, AR15 Lite Rail™ II, AR15 Lite Rail™ III, and SLiM Rail™. They are precision machined from 4140 steel and have a Mil-Spec Heavy Phosphate finish. It is designed to be torqued down or removed with the Bolt-Up System Barrel Nut Wrench (Sold Separately). This barrel nut will work on standard AR-15, M-4, and M-16 pattern upper receivers and barrels.
