ohhunt® AR-15 M-LOK Free Float Handguard Integrated Flip Up Front Sight

Each handguard comes with both of allen wrench, a flip up front sight assembly for emergency use as a backup sight. Made of Aircract T6 6061 Aluminum, includes Free BarreI nut.Barrel Nut: External Diameter:1.38 inch, Inner Diameter:1.02 inch.Barrel Nut Thread Size: American Thread 1 1/4-18Fit: .223 / 5.56 RifleColor: Black Anodized