For those looking to build their own modern sporting rifle, the Ruger 8506 AR Lower Receiver is an excellent centerpiece component. Crafted from high-quality 7075-T6 aluminum, this lower receiver boasts a durable black hardcoat anodized finish, ensuring long-lasting performance and reliability. Designed for the AR-15 platform, it supports both 5.56 NATO and .223 calibers, making it versatile for various shooting applications. This semi-automatic lower receiver is ideal for enthusiasts and builders seeking a robust foundation for their custom AR-15 rifle. With its CNC-machined precision and multi-caliber compatibility, the Ruger 8506 AR Lower Receiver is a top choice for anyone aiming to create a reliable and customizable firearm. Please note that this is a lower receiver only, requiring additional components like a lower parts kit, buffer, and stock to complete the build. It must be shipped to a Federal Firearms Licensed Dealer (FFL Dealer) and is subject to all applicable federal, state, and local laws and regulations. The UPC for this product is 736676085064, and the MPN is 8506.