The Faxon Sentry AR-15 lower receiver is a precision-machined component designed to serve as a dependable foundation for custom AR-15 builds. Built to mil-spec dimensions from high-quality materials, it offers broad compatibility with standard AR-15 parts and accessories. With an emphasis on durability, fit, and consistent performance, the Sentry lower is well suited for builders seeking a reliable, no-nonsense receiver for a wide range of applications.