Action: Semi Automatic - Caliber: 223 Rem/5.56 NATO - Finish: Black - Barrel Length: - Weight: .5 lb. Specifications and Features: Accepts any standard AR-15 type upper receiver Forged lower receiver Teflon coated black anodizing - Start your next AR-15 build with a quality forged lower receiver from Del-Ton. These stripped lowers follow the military pattern exactly making them a perfect start to a military clone build. Build up your favorite shooting hobby with Del-Ton. Forged 7075 T6 Aluminum that has been hardcoat anodized. Stripped lower only does not include any internal parts.