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 1/4-18
Fit: .223 / 5.56 Rifle
Color: Black Anodized