Product Description The ARMASPEC Self-Retention Castle Nut in OD Green redefines stability and simplicity for your AR-15/M4 build. Featuring Armaspec&';s innovative patented thread locking technology, this castle nut locks securely in place without the need for staking or thread locker, eliminating extra installation steps and reducing the chance of costly errors. Precision-machined from premium-grade 7075 aluminum, it delivers exceptional strength and durability while keeping weight to a minimum, making it the ideal choice for high-performance lightweight builds. The quick and easy installation design saves time without compromising reliability, and the hard-anodized OD Green finish provides outstanding corrosion resistance along with a clean tactical aesthetic. Product Highlights Patented self-retention thread locking technology secures the nut in place without staking or thread locker Precision-machined from premium-grade 7075 aluminum for superior strength, durability, and reduced weight Compatible with AR-15/M4 platforms for broad versatility across builds Anodized OD Green finish offers corrosion resistance and a tactical appearance Designed for quick and easy installation, saving time without sacrificing performance Specs Brand: ARMASPEC MPN: ARM6521-ODG UPC: 810048494019 Compatible With: AR-15/M4 Material: 7075 Aluminum Finish: Anodized Color: OD Green 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.