Building a custom AR-15 starts with a solid foundation, and the Guntec AR-15 Complete Lower Parts Kit provides everything needed to assemble a reliable lower receiver without the hassle of sourcing individual components. This mil-spec kit from Guntec USA delivers precision-engineered parts for smooth operation and long-term durability in your tactical or sporting rifle build. Specifications Weight: 8 oz Dimensions: 6 in (L) x 4 in (W) x 2 in (H) Finish: Black Material: Steel components with varied materials for springs and small parts Compatibility: Standard AR-15 lower receivers Manufacturer: Guntec USA