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, MFR and MFR XL, AR15 Lite Rail, AR15 Lite Rail II, AR15 Lite Rail III, and SLiM Rail, as well as the R-III line.  The RIS-II includes the Mk18 and M4A1 rails.

The barrel nut is 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.

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.

Manufacturer's Part Number:  01-002-07234-131