6-position mil-spec stock assembly Fits AR-15 and M4 rifles Impact resistant, high-strength material Mil-spec diameter extension tube made from aircraft aluminum, hard anodizing Built for heavy-duty operations with tightest tolerance control Includes action spring, buffer assembly, tear-drop ring & locking ring Aluminum/plastic material 18.2 oz Black Made in America * Replace the cracked or broken buttstock on your gun with this 6-position UTG stock assembly. The stock assembly is made with durable impact resistant material and the extension tube is made with hard anodized aircraft grade aluminum. Includes action spring, buffer assembly, tear-drop ring & locking ring, black.