Midwest Industries Combat Rail, Handguard, 4.5 Length, M-LOK, Includes 5-Slot Polymer Rail Section, Barrel Nut and Wrench, Fits AR-15, Black Anodized Finish MI-CRM4.5 The Midwest Industries Combat Rail Series Handguard is a 1-piece design that features M-LOK accessory mounting slots on 7 flats along its length" a full length Picatinny rail at the 12 o'clock position and two QD sling swivel mounting points. This robust design has a slim profile and is machined from rugged 6061 aluminum with a type 3 hard coat anodized finish. Comes with mounting hardware" barrel nut wrench and a 5-slot polymer M-LOK accessory rail. Midwest Industries is a proven leader in the firearm industry. Made in the USA" focusing on the small details to make your rifle platform better.