• Super slim 1.5 inch outside diameter, 1.3 inch inside diameter • Incredibly lightweight: •15 inch model weighs only 10.3 oz with steel barrel nut • Five anti-rotation QD swivel sockets • Includes one 2.1" KeyMod rail section • High quality MIL-STD 1913 top rail, T-marked for accessory location • Constructed from 6061 aluminum, hard coat anodized for a lifetime of service • Fully dehorned for a non-abrasive, comfortable feel • Barrel Nut Wrench included • Minor gunsmithing required • 100% Made in the U.S.A. with Lifetime Warranty