Incredible lightweight. Slim 1.5 inch outer diameter. One 2.1 inch KeyMod rail section included. Five anti-rotation QD sling swivel attachment points. Gen3 torque plate system. High-quality MIL-STD 1913 top rail sections at front and rear. Rugged 6061 aluminum construction with hard-coat anodization. Fully dehorned for a non-abrasive comfortable feel. Proprietary barrel nut and wrench included. 100% Made in the U.S.A.