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.Type: Buttstock KitFirearm Type: AR-PlatformFirearm Model: AR-15Material: Polymer w/Aluminum TubeFinish: BlackPositions: 6Tube Included: Yes