Speededge AR9 Carbon Fiber Handguard + Barrel Nut
You need to purchase the Barrel Nut which is custom made for this handguard.
The barreL nut is listed as one of the variations/options in this product listing.
This handguard comes in two types of finish: Matte and Glossy.
Each finish is available in different lengths: 10, 13 and 15 inches and comes in two styles: With holes or Plain/ No holes.