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It's easiest if you have the actual Daniel Defence barrel nut wrench, but you can do without. Just make sure you don't damage the notches.
You would apply the collar first, followed by the barrel, and then the barrel nut. Once the barrel nut is tightened down and you've confirmed the outer barrel does not wobble, slide the handguard over the barrel and secure to the collar with the 6 screws. Once secured, attach the bottom portion of the handguard and attach the 4 screws on the sides (two per side.)
Finished.
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