UTG PRO AR15 Ops Ready S1 Mil-spec Stock Kit in Black Mil-spec stock molded from impact-resistant, high-strength polymer Mil-spec diameter extension tube Built-in rubberized buttpad Dual storage compartments with removable, waterproof caps Integral ambidextrous sling loop and QD sling swivel housing Extended, 8-inch length for increased length of pull Snag-free design with fully dehorned corners and melted contours Dimensions: 5.5" height, 8.5" length 23.1 oz. Designed and built in the USA Includes polymer stock, mil-spec, 6-position extension tube, buffer, buffer spring, tear-drop ring and castle nut Lifetime limited warranty