The Bolt-Up System Barrel Nut Wrench is a proprietary spanner wrench required to install Daniel Defense Bolt Up System Barrel Nut. This wrench is designed to be used with a 1⁄2 Drive Torque Wrench
The Bolt Up System Barrel Nut Wrench is used on the following rails:
AR15 Lite Rail
AR15 Lite Rail II
AR15 Lite Rail III
Rail Interface System II (RISII)
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