UTG Pro Mil-Spec OPS Ready S3 Stock Kit is a black 6-position stock kit for AR-15/M16 platforms, molded from high-impact reinforced polymer. Features an ergonomically chamfered rubberized butt pad and slanted cheek rest for shooting stability, plus an integral ambidextrous sling loop and ambidextrous QD sling swivel housing for left or right-handed shooters. Fully dehorned corners and melted contours for snag-free use. Kit includes polymer stock, mil-spec 6-position extension tube, buffer, buffer spring, tear-drop ring, and castle nut. Safety note Follow all manufacturer installation instructions. Verify proper function and secure mounting before use. Comply with local firearm laws and regulations.