Looking to put together a custom AR-15, tailored to your specific needs? The Sharps Bros. Overthrow AR-15 Lower Receiver is a great starting point for your next build. With an open mag well helmet design, battle worn dents, sword gashes and crack lines, the Sharps Bros. Overthrow AR-15 Lower Receiver is constructed entirely from 7075-T6 aluminum. Features black hard-coat anodized finish Multi-cal marked Weight: 11.5 ounces The Sharps Bros. Overthrow AR-15 Lower Receiver can be used with any mil-spec internal components, ensuring that you can build your rifle to fit your wants and needs.