Utg stock assembly ar-15 black 6 position mil-spec FEATURES -Proudly made in the USA-Polymer stock made from impact resistant high-strength material-Mil-spec diameter extension tube made from aircraft aluminum with rolled threads, hard anodizing-Built for heavy-duty operations with tightest tolerance control-Stock assembly complete with action spring, buffer assembly, tear-drop ring, & castle nut Other Features: Includes buffer, spring, mil-spec buffer tube, end plate and castle-nut, made in the usa