The Daniel Defense Bolt-Up System Barrel Nut is designed to work with the Bolt-Up Plates used in mounting the following handguards:
MFR and MFR XL
AR15 Lite Rail, AR15 Lite Rail II, AR15 Lite Rail III
They are precision machined from 4140 steel and have a Mil-Spec Heavy Phosphate finish. This barrel nut will work on standard AR-15, M-4, and M-16 pattern upper receivers and barrels. Comes in factory bag as shown.
This barrel nut will not work with AR-10 / SR-25 / .308 sized rifles.