The extension tube is made of high-quality 6061-T6 aircraft grade aluminum and has precisely rolled threads for durable thread engagement with lower receivers. It has undergone the tightest tolerance controls for a secure fit and function with various collapsible stocks. The extension tube is finished in a matte black Type III Class II hard coat anodize, which provides a durable and corrosion-resistant finish. This product is proudly designed and made in the USA, ensuring its quality and reliability.
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