Product Description The Fortis Manufacturing K2 Lightweight Enhanced (LE) Castle Nut and End Plate System is a precision-engineered solution designed to virtually eliminate the risk of your castle nut ever backing out. As part of Fortis&';s innovative two-system approach (K1 and K2), the K2 system installs the castle nut onto the end plate using a robust, reliable mechanism that stays true to Fortis&';s commitment to ingenuity. Crafted from 7075 T6 Aircraft Grade Aluminum, the set features a Black and Gray anodized finish, offering both durability and a sleek appearance. The integrated Quick Detach Socket provides a 360-degree rotational locking interface, making this an excellent upgrade for any AR-15 build. At just 0.55 oz / 16.8 grams, it adds virtually no weight to your rifle. Proudly made in the USA. Product Highlights Ultra-lightweight design at only 0.55 oz / 16.8 grams total, minimizing added weight to your AR-15 Constructed from 7075 T6 Aircraft Grade Aluminum for maximum strength and long-lasting durability Quick Detach Socket with 360-degree rotational locking interface for fast and secure sling attachment No set screws, no ratcheting system, and no staking required, simplifying installation and maintenance Made in the USA with Fortis&';s trademark precision engineering and anodized Black and Gray finish Specs Brand: Fortis Manufacturing, Inc. MPN: LE-BLK-K2-GRY UPC: 810103343276 System: K2 Lightweight Enhanced (LE) Castle Nut and End Plate Compatible Platform: AR-15 Material: 7075 T6 Aircraft Grade Aluminum Finish: Anodized, Black and Gray Weight: 0.55 oz / 16.8 grams Quick Detach Socket: 360-degree Rotational Locking Interface Country of Manufacture: USA 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. ]]>