The Sharps Bros. Full Top Rail M-LOK handguard is a one-piece free floating unit that is an attractive, functional upgrade for your AR-15. It features a full length of Picatinny top rail for the addition of backup iron sights, and M-LOK accessory mounting slots on 7 flats along its length. It includes a barrel nut and hardware for installation.Features :Handguard is Made of 6061-T6 Aluminum and Anodized Black Per Mil-Spec MIL-A-8625F, TYPE III, CLASS 2The Barrel Nut is 4140 PH SteelFull Top Rail + MLOK Slots on 7 Other Sides