Midwest Industries MICRM45 Combat M-Lok Handguard AR-15 Black Hardcoat Anodized 6061-T6 Aluminum 4.50" Made In USA, The Combat M-Lok Handguard Is constructed Of 6061 Aluminum With a Continuous 1913 Picatinny Top Rail, Two Integral Anti-Rotation QD Sling sockets, And Seven Sides Of M-Lok. It Also Utilizes a 4140 Heat Treated Barrel Nut, 4140 Heat Treated Torque Plate, And Is Fully dehorned And deburred. The Handguard Includes a Barrel Nut, Wrench, And 5-Slot Polymer M-Lok Rail. Firearm Model: AR-15 Material: 6061-T6 Aluminum Finish: Black Hardcoat Anodized Features: M-LOK Rails: Picatinny Swivel Studs: Quick Detach