A burnt bronze 80% lower is a partially machined lower receiver for AR-15 or AR-10 rifles, finished in a durable, metallic burnt bronze color. It requires additional milling to become functional. Once completed, it works with AR-15 or AR-10 upper receivers, lower parts kits, buffer tubes, stocks, magazines, and other standard components. The burnt bronze 80% lower is ideal for DIY builders seeking a unique, custom look while maintaining full compatibility with standard AR-platform parts for hunting, target shooting, or tactical builds.