These forearms utilize our anti-rotation screws to insure that the forearm stays solid even under strenuous use. Perfect for use with forward grips and optics. Features include: mounting points for Swiveling Sling Studs (YHM9469), Mil. Spec. Picatinny rails, and they accept the Forearm End Caps. The barrel nut and forearm tube are made of aircraft quality aluminum and hard-coat anodized to Mil. Specs. The jam nut is made from steel and plated a matte black to match. All assemblies include: one jam nut, one barrel nut, 2 anti-rotation screws, and one forearm tube. Made in the USA. YHM Overall length: 9.2 in Weight 12.4 oz.