UTG PRO AR15 Ops Ready S1 Mil-spec Stock Kit is built for heavy-duty operations with the tightest tolerance controls to provide the most secure fit and function. The Mil-spec stock is molded from impact resistant high-strength polymer in black, the mil-spec diameter extension tube is precision machined from aircraft grade aluminum with rolled threads and anodized for best corrosion and wear resistance, ergonomically chamfered built-in rubberized butt pad and a slanted cheek rest enhances shooting stability and promotes consistent firearm control. Dual storage compartment with removable waterproof caps provide dry storage for batteries (Up to 8 CR123) or other accessories. Integral ambidextrous sling loop and QD, extended 8" length for length of pull. Includes polymer stock, mil-spec 6 position extension tube, buffer, buffer spring, tear-drop ring and castle nut. Snag free performance with fully dehorned corners and melted contours for increased comfort. Proudly made in USA.