Product DescriptionThe Fortis Standard Castle Nut is a lightweight, durable upgrade for AR-15 style builds using mil-spec buffer tubes (receiver extensions). Machined from a solid piece of billet aircraft-grade 7075-T6 aluminum, it delivers a significant weight reduction without sacrificing strength. Finished with a Type III hardcoat anodize for enhanced wear resistance, this castle nut installs with a standard stock wrench and is proudly made in the USA.Product Highlights Billet aircraft-grade 7075-T6 aluminum castle nut designed to reduce weight on your rifle build Ultra-light 0.2 oz design helps save ounces while maintaining durability Fits mil-spec buffer tubes / AR-15 style receiver extensions for broad compatibility Type III hardcoat anodized finish for improved wear and corrosion resistance Installs with a standard stock wrench; made in the USASpecs Product Type: Castle Nut Compatibility: Mil-spec buffer tubes (AR-15 style receiver extensions) Material: Aircraft Grade 7075-T6 Aluminum Finish: Type III Hardcoat Anodize Weight: 0.2 oz Country of Manufacture: USA Manufacturer Part Number: CN-Stand UPC: 850015927065 Brand: Fortis Manufacturing, Inc.Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.