The Grey Ghost Precision® AR-10 M-LOK® 15" Handguard is crafted with 6061-T6 aircraft aluminum with a corrosion-resistant Class 2 hard-coat anodized finish for superior strength and long-lasting durability. The full-length Picatinny top rail features numerical T-markings for easy mounting. M-LOK attachment slots at 3, 6, and 9 o'clock along with forward M-LOK slots at 1 and 11 o'clock positions offer plenty of mounting options for your favorite weapon-mounted accessories. Includes non-proprietary barrel nut and 2 fastening screws. Compatible with all forged upper receivers and most billet upper receivers.